idk what to do...

so I gave birth 3 weeks ago it'll be 4 weeks tomorrow. I seen my ob at 2 weeks and was cleared to have sex. I wasn't bleeding, I didn't tear, and didn't need stitches like my last pregnancy I past 6 weeks because I kept bleeding. Anyways so me and my husband had sex that same night which was Wednesday and we haven't had sex since I was 8 months pregnant. So he finished super fast but when he pulled out he told me hold on not to move. it was dark so I asked him did he finish on top of my vagina because it was wet. He tells me no but when he turned on the lights and walked out there was sperm this is how I got pregnant my second time when he pulled out and some got inside and the rest on my vagina. I'm not sure how fast you can get pregnant after giving birth but I had doubts I'll get pregnant. I decided to give it another week and we had sex again and the same problem he pulled out. I told him i don't want to have sex anymore unless it's with condoms he doesn't care if we get pregnant again he loves his boys. He just kept joking saying I wouldn't be surprised if your pregnant again. As of right now I wanted to wait until my baby was 1 and my oldest was 7 has anyone gotten pregnant after giving birth ?