Surprise pregnancy

I went to the urgent care because I am sick with a sinus infection and uti. Come to find out I’m pregnant. When the doctor told me I fell to my knees crying!!!!

I am on birth control and take the pill religiously but the antibiotics I was on made the pill not work. So here I am pregnant with three kids 6,4 and 8 months old. I DONT know what to do. I have always been against abortion but my husband and I can not afford another child. Our home is too small and we would need a bigger car. I just needed to vent I’m scared to death. I’m not even sure how far along I am yet but estimated due date 10/26/2020