Discrimination? (LONG POST)

I'm currently 34wks pregnant. I had been working my entire pregnancy up until the corona put me out of work in mid march. I was about 23wks at the time. My place of employment finally reopened and I was 32wks. I torn on whether to go back or not. Physical labor plus being at risk for the corona, after much thought i decided to go back, plus i work retail so I could use my discount to get some stuff for my baby. On the first day back our manager explained that we were required to wear masks and if we had an issue with the mask we could wear a shield with Dr. Note as some other employees had already done so. I let her know I was intending to get a note and she said that would be fine. In the mean time I worked with the mask and ended up keeping my nose uncovered as it was hard to breathe. I felt like I died after each shift. I hurt so bad when I got off and even worse after I woke up. I could barely walk. I do overnight stocking, all that standing, constant moving, pushing pulling, lifting etc, it was just too much. After a straight week of that I requested to drop down to 2 days a week, any 2 days but only 2. My job is pretty flexible with people but my request was denied. I was fuming and decided I was gonna quit since they can't work with me.my coworkers begged me not to quit and just talk to my boss. I did eventually, 3days later and she said it was denied bc i didn't pick 2 specific days 😒 ok whatever. I pick the two specific days. 2 days later I went in and they announced they would be writing people up for leaving their nose uncovered or removing their masks. I finally had seen my dr and was able to produce a note that should allow me to wear the shield instead. 2days later I got a call from management saying my "request" to wear the shield was denied 😒 and since I couldn't wear the mask I needed to take leave early, right away? And then proceeded to remove me from the remaining shifts I was already scheduled for. I don't want to work anyway I was just trying to keep my discount but I don't see how they can do that? I feel targeted or am I looking at it too hard? The Other employee had been wearing the shield for 2wks at this point so why wasn't it discovered until I submitted my note? Would u let it go and move on or what? Currently 34wks, don't want to work, a lot going on, trying to sell my house so I actually need the time off but still don't feel like its right? Feels shady?

ETA: When I went in for my next shift after my manager told me I'd have to take leave, I found I had been taken off the schedule. I proceeded to the back to talk to my manager and saw she had 2 new hires doing paperwork and videos 😒