Hi I'm not really sure how to feel

I'm 19, I am in a situation with my partner, he has borderline personality disorder and has been really struggling the past few months with lots of suicide attempts.

He took drugs that he believed was Xanax but contained Herion and was in hospital after being unconscious for 40m after falling and damaging his head and police custody which I was told was drug induced psychosis, they kept him whilst he was withdrawing and he has been pretty well with help since.

During that time I had a male friend I hadn't had contact with for years and my best female friend they came over, my partner found out and now doesn't trust me which I understand, he had forgiven me for not telling him etc but yesterday I found out I was pregnant.

Because of what happened he doesn't remember sleeping with me during that time and thinks it could possibly be the other guys child.

Everything was smooth again and forgotten about until I told him. And I stupidly told him I wasn't pregnant so he wouldn't go back after how far he has come.

I don't feel now is the right time to have a child. I don't feel it's the right choice to put somebody else let alone a child through the stress of uncontrolled mental health.

I'm currently 3 weeks & 3 days (last period 2nd August)

The worst part is I conceived on the pill.. Because I really did not want to have to deal with this on top of everything else.

Please someone just tell me it's going to be ok 😭 I have never done this before and I never thought I would either.. I refuse to go past 4/5 weeks of pregnancy.

Help please😭