Pregnant before first postpartum period

I’m 5 1/2 weeks postpartum and have yet to have my period. I’ve been super crazy horny and my husband has had such strong convictions about not having sex until my IUD gets put in (Friday). Well early this morning those convictions failed him and I woke up to a happy new years. That being said the minute we finished he was filled with instant regret because he couldn’t wait and doesn’t want baby number two so soon. I’m not asking for judgement and if I am pregnant we’ll have another treasure to get ready for. My question is how many of you ladies were pregnant again within the first 6 weeks postpartum or before your first period?