Can they fire me under these cirstances?

I've been working st UPS for almost 16 months and I am 9 1/2 weeks pregnant. They've known this since my 3rd week, when I found out. for 13 months, I was in ODC and they had to transfer me because the work was to slow to small sort. This may sound like I'm paranoid but I know that they haven't like me since I complained and said that they don't go by the contract. Everyday they har me about my speed but yet it says nothing in the contract about how many packages you have to do per hr. What it does say is that you have to do your best. Me being new and pregnant, I was doing on an average of 260-270 pkg per hr. For only being up there for a short time and being pregnant, with the fan so high in the ceiling that I can't feel it, I think it's pretty good. So I talked to a union rep and they stopped haring me for 2 days and then they started back up again. When I asked for gloves so I wouldn't get any more of the slivers that I get from working with no gloves, they denied me the gloves claiming they ran out and not going to have any until November, when the holidays start back up. I was given those blue plastic gloves that nurses use but those were useless because they rip so easily and the slivers still can get through them. So I went to go buy my own gloves and I found these gardening gloves that were okay. The material seemed think enough where slivers wouldn't get through it. Only problem was that they were a little big on me but I know I could manage. When I started wearing them at work, my supervisor starts to discourage me about wearing them saying "It's going to affect how fast you go" and "how are you going to be able to type in the track number?". Things to that affect. This past July 4th, I had a very close friend tragically die and I always seen her as the sister I never had. The only thing that separated us from being sisters was our blood. She seen my mother as her mother as well and I seen her mother as my mother too. We were inseparable. So I told work that it was my sister who ped away, that was the monday after 4th of July. I had 3 days to grieve but the wake wasn't until Later in the week (friday) and considering I was still hurting from her tragic death, and the distance from work and where the wake was located at, I took that week off returning to work that coming Tuesday. For that whole weekend through wed. I was spotting, so Tuesday before work I made an emergency appointment the next day (wed) with my ob/gyn to make sure everything was okay. Everything was okay. Every since then, I haven't been feeling good because of my pregnancy. The usual, mourning sickness, hot flashes, mood swings, and mostly depression. Most of the time when I eat I have to force it down my throat and then I end up vomiting, which is a sign of depression. So after that Tuesday I went to work, I haven't been in. I called in wed and thurs myself and friday I had an aunt call in for me because I was vomiting at the time and they like the calls to at least be in hr in advance to the time i am suppose to be in and it was already almost half hour late on calling in so I had her do it to get it done quicker. She had the phone on speaker and all that was said was to call back when I was ready to come back to work. They said nothing of my 15 almost 16 months of working there that if I was absent for 3 days then I had to call them and tell them that I'm still not ready. Just to call back when I'm ready to come back to work to book back in. Anyways, I didn't go to work that next week because of the same problems. They claim that I'm on an unauthorized leave and that they haven't heard from me in 2 weeks, which was a lie, it was one week! That next Monday (this past Monday) I was trying to force myself to go but it was just to hot and here comes the hot flashes. The fact it doesn't help that my car doesn't have AC either and my car is black. If I drove while in that heat, I'm afraid I could p out completely and crash. So I didn't make it on Monday. During the day Monday I got a call from this lady in the HR office asking me to call her back and I did and explained to her what they failed to tell her, that I am pregnant and I told her about the mourning sickness and hot flashes and depression that has been occurring. She understood and said, "at least your having a baby!". I agreed with her trying not to cry because most of the depression I have is because of the fact that the baby was conceived through . That just adds on to the depression I have that naturally comes along with pregnancy. She told me she would call me back if she needed more information and she hasn't called back since. Monday night a different lady in the HR office had called me and has done nothing but give me attitude. Personally, I was a little surprised because I know this lady and she was a sweetheart but I guess the tables have turned. She was suggesting me to get a doctors note so I can go back to work. I haven't been able to reach my do