8 weeks postpartum help!!

Hey guys I’m 8 wpp, my husband and I had sex about 3 weeks after having my little guy and have continued since. He has pulled out every time but I know there is still a risk with that. What I’m wondering is when should I take a pregnancy test just to set my mind at ease that I haven’t gotten myself pregnant again! 🤦🏻‍♀️ I did bleed a little at 6 weeks lasted about 4 days but was pretty light so not sure if that could have been a period or not!