Am I the problem? Please be transparent with me.

I would like advice and I am able to take tough criticism as I never take things personally when it comes to advice. I have a boyfriend, we have been together for a short span of time. My period was due 3 days ago. I’ve been waiting and waiting and waiting, the cramps felt stronger so I was getting prepared. Until finally, I just took a pregnancy test and the faintest smallest pink line because visible and it is clear I am pregnant.

Every time my boyfriend has sex with me he pulls out well ahead of time, way before he needs to cum and then he cums far away from my vagina. One time he came around my vagina I fingered myself so sperm could’ve got inside.

I sent him a text I said “well I’m pregnant” he asked me what I was talking about and said it couldn’t have been from him.

He has been calling and calling, but I am drained. He was here earlier, before I found out and he slept the entire time I gave him oral because he’s an alcoholic and forced me to continue. I was so drained I did it so he would stop asking. My guy friend says that it blows him that one little tiny sperm could get me pregnant and thinks IT sounds very unlikely that it’s from him.

Am I the problem? If my relationship fails because of this is it because of how I’m acting right now? Not taking his calls etc. I am honestly drained I just don’t wanna talk. I don’t wanna argue I don’t wanna fight. He makes me feel insecure. I just wanna be by myself. If it comes to that point, I will just have an abortion. I don’t want any trouble.