Spotting 8wks pp Am I pregnant

So I'm 8 weeks postpartum and every couple days I'll spot for like two or three days and it'll stop. I get timely cramps here and there but it's never more then spotting. It was pink but now it's red spotting a couple days every week or so. I'm breastfeeding and have been since he was born. We have been having sex since three weeks postpartum and I know we are stupid but my husband uses the pull out method since we never  remember to go grab condoms. What I was wondering is could this be implantation bleeding or a sign of pregnancy