Pregnant 3 months after giving birth?

Megan

Ladies, this past October I had my beautiful baby girl! My husband and I waited a solid 8 weeks to have sex. I started taking birth control again a few days after my 6 week postpartum check up. Well, I had a period last month. This month nothing yet... I’ve been feeling nauseous. Food hasn’t sounded good to me, and I’ve had acid reflux (I had all of these symptoms when I was pregnant with my first baby). I take my birth control religiously. We aren’t trying for another baby yet (clearly). Lol I just wanted to know if anyone has gotten pregnant by surprise this quick after giving birth and using birth control? Thanks!