Need advice on abortion

I’m a 20 year old mom to a two and a half year old boy and a 8 month old boy. In between those two my husband and I had two miscarriages trying for our youngest and it was the hardest thing ever. I have a condition where I have to give myself shots every day to have a successful pregnancy and that’s really hard. We just found out yesterday that we’re expecting another little one. We are so stuck on what to do because we didn’t want anymore kids. We are financially stable but my husband is worried what dealing with three kids will do on my mental health because I’ve had really bad pp depression the last couple months. Plus I’d be pregnant for my 21st birthday which I don’t care at all but my husband cares. Can I hear some of your guys stories about why and how having an abortion affected you... do you regret it?