Is This Discrimination Or Just Bad Luck?

I (late 20’s F) am married with a husband (30’s M) and a son (1). I work at a private institution and everyone has been friendly until recently. I was getting tips from supervisors and seniors in my department on how I could do better in the future as well as getting praises every now and then. They even sent me as 1 of 10 people to go to a new location they opened and to help it grow. However it seemed as if there was a shift in the air once I told my new supervisor that I was pregnant. I see now that I should have kept quiet about it but I was excited, super nauseous and gagging all the time, always looked tired, and I was starting to show early since it was my second child. Once I did that it seemed as if I was no longer allowed to do things I could previously. For example, if I needed to take a long lunch because I have a doctors appointment that was ok and I would use PTO to make up for it or I would make up the time in the same week. Now it was seen as “making accommodations”. I was told that I was showing up late (I always let them know if I would be more than 10 minutes because of traffic) and leaving early (I left early one day because I was throwing up under my desk and couldn’t sit up straight). I was also accused of not showing up because of my pregnancy (I was sick. Caught something from my son that took days to get over). After this I was forced back to the previous campus that was double to time to get to, even after protesting. Now I am on my finally warning suddenly. When I asked for proof of the other warnings because I was confused as to why I was in trouble I was sent a list of dates that I had meetings with my supervisor. These meetings were simply weekly check ins to see how everything was going. Everyone in the department meets once a week to discuss metrics and game plans for the week. Yes, my metrics are not the best, BUT they told me I was doing really well especially with having to start all over after being moved back to the original. The next day is when I got a final warning. I know for a fact that over half of the department has similar metrics but it seems as if they are trying to get rid of me before I go on maternity leave. I have not been here a full year and I’m 50% sure I will get fired. Is there anything I can do/should do? I was told if I don’t show significant improvement by Monday I will be in trouble up to and including termination. (GA)