Somebody help me

I’m not sure if this is the group to post this in or not but I’m hoping someone can help me. I’m currently 12 months postpartum and breastfeeding. Last month I had my first postpartum period. My husband and I wanted to wait a little longer before we started trying for another baby so we normally use condoms or the pull out method. This month, the day before Glow predicted my period to start, he came inside of me. Now my period is almost 5 days late and I can’t figure out what is going on. I’m not sure whether I could be pregnant or now if there is the chance that my fertile week would have fallen around the time we didn’t use protection. At first I thought maybe my cycle hasn’t regulated yet but then I remembered about a week and a half ago I went to the bathroom and wiped and there was one spot of blood. Never anything more. 2 days ago I started cramping and though that had to be it but still no period. I decided to take a pregnancy test after I was two days late but it was negative. Does anyone have any incite as to what might be going on? Could I be pregnant? Could I possibly get pregnant now that this cycle is messed up?