Tracey i feel so sorry for you, if it isnt stressful enough at this moment in time for you, you have this to contend with.
I guess nobody can really comment on this situation as its a hard one to be in with.
But if I were in your situation (My parents are extremely strict, I moved out 6 months ago and I struggle sometimes financially but i have my lovely fiance for support ps am 23 and they still treat me like a child! So i do sympathise with you They also chucked me out because of a boyfriend - ex).
However if I were you, personally Id want to get my head round the whole pregnancy thing first. Correct me if am wrong but the first trimester is the dodgiest why put up with stress and risk your pregnancy due to your parents views!?!.
You really dont need this stress and If you can buy yourself some time to sort yourself out, know what you want to do and chill out abit then I think thats what you need to do.
I know this may cause problems later on down line, but that spare pregnancy test, If i were in your shoes id get my partner to wee on it, show your parents the negative, and get them off your back, even if its only for a few weeks. If i were you and I was under so much stress and ended up miscarrying I would feel so much hatred towards them and i would most probably blame the miscarrage on stress due to them. Really you have to look after number 1.
Of course doing this would cause problems later on down line eg when you begin to show, but at least you would be past the most crucial part of your pregnancy, perhaps by this time you would have housing sorted and perhaps they would also see your relationship with your current partner is more meaningful. Also you could use this time to do some life changes, perhaps make an effort to spend more time with ur parents and get on their good side?
PLEASE NOTE I AM ONLY TELLING YOU WHAT "I WOULD DO IN YOUR SITUATION" AND NOT WHAT I THINK YOU SHOULD DO.
I hope everythign works out babes