Get a blood test from your GP or a sexual health clinic as soon as possible to confirm whether you are pregnant.
Put your own safety and ambitions first,
If the test is positive, then you can decide how you want to proceed with the pregnancy.
If you decide to be a parent, best to avoid dating whilst pregnant and when looking after a young baby.
Your focus has to be on staying healthy and positive, with very limited exposure to anything you know will only add to your stress levels.
If you know that you don't want your manipulative ex involved in either your life or the life of any future child you have, just go nc.
End all contact with him and never ever agree to go anywhere near him again, no matter who he sends to try to persuade you.
Either close down the social media accounts that he follows you on or block him.
Change all your contact information and switch your social media profiles to private so that he won't won't easily be able to get in contact with you.
Good luck!