Guilt setting in

I had an abortion in June 2017, I thought long and hard and due to my life being in shambles at the time I knew I was making the right decision. I don’t know if it’s because my due date is coming up, but recently I’ve been feeling an extreme amount of guilt. I can’t look at pregnancy announcements without getting upset or just babies in general right now, I’m constantly crying and just feeling so bad. I know deep down that I made the right decision but I just feel so horrible and upset with myself right now. I’m feeling really hopeless and could use some advice on how to cope.