Abortion after pregnancy

I know this is probably an unpopular opinion so I’m posting anonymously. That and I’m ashamed of myself. I have a 4 month old and have been taking birth control since, but I still got pregnant. I can’t possibly imagine another baby right now, no matter how much I love my LO. I was doing everything right and this still happened. I don’t know what to do. I don’t think I could have this baby and give it up but I can’t possibly raise it right now. Abortion seems like the only option. But I feel it makes me a TERRIBLE person.