It’s sad that my job doesn’t understand

Im 26wks&5days pregnant with a high risk of early preterm labor. With my first pregnancy I had my son at 35wks but i was put on bed rest and contracting since 20wks, they did a lot to keep lil man in there long enough. With this pregnancy I was put on the Makena shot every week from 16wks up till 36wks, I can say they are doing somewhat of something so far. I’ve been experiencing pelvic pressure and Braxton hicks since probably 22wks, with all the pain and discomfort I still manage to work, clean, cook, pick up my son from school and do everything every mother has to for their family. My job on the other hand is another story, since I’ve told them im pregnant not one of them I feel as taken me seriously, there always telling me how I’m still small and I can still do half the things a non pregnant women can do, they have have me lift heavy boxes, step on step stools, my high risk doctor gave me a medical note to take a break 2-3hrs a shift and with that they still not comply with it. Sometimes I don’t even get a break, I work as a sales specialist for Victoria Secret and it’s impossible to leave the floor unattended if a manager doesn’t take your spot. I’m very tired and over my job not caring enough for me and making me feel less because I’m pregnant. I got into a minor car accident last night and was experiencing pain and just because I worked this morning I didn’t go and get checked. I came to realize that there not going to care about me so I need to step up and not care as much as I do and that my child comes first. So here am I driving to the hospital to get seen, and all I got as a response from my manager after I told her what happened to me and how I won’t be going to work and that I’m sorry is “ok”. My job sucks, sorry for the long paragraph just needed to vent and let it out