Sorry if this is a bit lengthy, I started working as a housekeeper in November and it was very hard work as they hadn't had one for a while due to dismissing the previous one. Anyway now that I've caught up I have slowed down as there just isn't enough to do in the hours I work. They are very lax with dinner times and have a "take as long as you want as long as you dont take the p**s" policy.
I found out I was pregnant 4 weeks ago after having an ectopic and left tube removal in may last year. I told work as I have been really struggling with feeling very unwell and I'm having some mental health issues (currently awaiting councelling). So yesterday I was called into the office by the admin lady and told that staff and residents are talking about me as I took too long on my break the day before (admittedly as was feeling horrendous) and that I'm putting my needs before residents. 
. I've spoken to all members of staff about this and I dont believe that any of them has said anything as we all have a good relationship and I always chip in and help them.
Last night I text the manager to say I'm sorry if she feels I'm taking advantage obviously I've spoken about struggling with mental health and I'm not feeling very good this pregnancy, I also asked for a clear and concise break time. She replied hours later basically saying that I'm not being a team player, she wont tolerate anybody having a negative effect on the house and that she is disappointed that I have slowed down in the last few weeks. From now on I'm to have 15 minutes lunch which she has no obligation to pay for but does. I'm so upset I dont even want to go in. Everyone else has 30 mins - 1 hour lunch plus multiple cigarette breaks throughout their shift. I have opened up about my issues and I am worse off now than i was before :(. I dont know what to do. I'm so down I could get a doctors note but i just can't afford not to work.