I think I'm pregnant

I have a question and I hope I can get some answers. I had my baby boy 14 weeks ago. He was born at only 25 weeks and he's doing good so far. I had to have an emergency c section. Doctor did not want to give me any birth control because I'm pumping. He said to use condoms and gel to kill sperm 🙄 I listened but not I think I'm pregnant. I don't know when I should get my period since I'm pumping it's so random it comes and goes. I have been using protection but I'm so scared to be pregnant. I have a one year old at home and my baby boy in the hospital only 3 months old. Can someone please tell me if it's dangerous to be pregnant with only 14 weeks pp with a vertical csection done? (Emergency csection)