I'm so sorry this is happening to you. Sometime you can't really depend on "family". You need to look into Social Services to help and save money.
That is ridiculous. I've had a similar situation. Before I get into it do you have receipts for the taxes and rent you pay? If so you can take them to court. It would also help if you got a recording of her saying it's because your pregnant.
We lived in my husband's mother's old place she couldn't make payments. His brother took over. Anyhow, his brother decided to move and left the place 3 months behind then she lied and said the payments for the house went up. Honestly I didn't care if they had or hadn't she could have told us the truth. We 2 years of paying house payments and taxes her other son decides he's ready to move back in and she tells us to move out. She tried to say we were behind. Ha Lol we had every receipt from every payment we made since living there every receipt from the taxes we paid. She couldn't do anything about it. I didn't want to deal with the crap so we moved.
It stinks when it's family doing this to you. Get out of there as fast as you can. Save that 600 dollars and go. If you want to go by and speak with a lawyer and see if you have a case. Parents or not they are still land lords and you have rights as a tenant. Look for renters rights in your county and state.
Thing is i pay them rent well above what it should be. I pay 600 a month plus i pay the taxes and the insurance on the place every six months. So as far as the money thing goes its not that because i have never been late on rent or any bill for that matter with them. Its just hurtful that if i did do something they dont agree with them come to me as an adult and tell me what it is. Im not upset about having to move or even them asking me to move out. Its more about the way they handled it. Like you said i am a grown woman with my own family and if they see it that way then they could atleast give me the respect of lettong me know what i did wrong. My father and i have always had an amazing relationship we are just close. He os truly the only family that i have left besides the family i started. I just wish he would talk to me but he wont answer my phone calls or text messages but everytime i try to call him my step mom will call me back and tell me to lose their number and that if i need to let my dad know something i can tell her that if she feels its important it will get back to him. He is just letting her rip our relationship apart and i honestly dont see where all this is coming from...
I guess one of them, your stepmom or your dad, or both of them, feel that if you are adult enough and doing OK financially enough to make the decision to have another baby, you are adult enough to find another place to live and pay for it. I'm sorry they took it out on you this way, but in any case moving out does not sound like a bad thing to do; you don't want to be under the threat of them pulling this kind of thing on you any time you did something they did not approve of, and it sounds like you would be in that position forever if you stayed. You're not daddy's baby any more, but a grown woman raising her own family. Put on some extra hours now when you can, and get a first month's rent deposit going, and move. Tell your dad later how hurt you were.