Reddit, I might be pregnant. I used two different types of birth control. I'm considering abortion. What the hell am I going to do?

I feel ridiculous posting this on r/askreddit, but I'm unsure of where else to post for advice.

I'm a few days late, and I've tested twice. Each test has had the faintest positive. I'm freaking out. I used a condom that broke and the next day took plan B. And here I am.

I already have two small children, and do not want anymore, whatsoever. My previous pregnancy (twins) was just about the worst thing I've ever experienced. I do not want to go through it again. I've also just escaped an abusive relationship with the father of my children. My hair stands up thinking about what would happen if he found out I was pregnant.

I never thought I would have an abortion. Never ever. I always told myself I would do adoption, but I just can't. I can't let anyone know I'm pregnant.

I'm so confused and scared, I have no idea what to do. If I am pregnant, I'm 98% sure I'll abort. I feel like the worst fucking person on the planet right now.