Irregular period after BC

Hi!

I stopped Birth Control in January. As soon as I stopped I got my period. In February I was a few days late but chalked it up to my body regulating. I should add we’re not actively trying. My husband has just been pulling out cause we aren’t quite ready but I wanted to give my body some time to adjust. I understand pull out isn’t a sure way to prevent. This month I’m going on 7 days late. While I plan on taking a test sometime soon I’m wondering what could cause this and if it’s normal if I’m not pregnant.