Should I be worried?

I’m sorry if it’s the wrong group. Yesterday my so and I had anal sex. When he came then the cum slide down by my vagina. Im 4 weeks postpartum. Is there any way I could get pregnant? I feel so dumb for asking I’m just being paranoid. I can’t get my iud until 7 weeks postpartum and I already have an appointment. Please no judgment just please someone calm my stupid nerves down😂