9 days late and 2 BFN

I’m a breastfeeding momma with an 8 month old baby boy. I’ve had a regular period RIGHT ON TIME for the last 5 months. This time around though I’m 9 days late. I have cramping and feel as I do when I’m PMSing but nothing. My husband and I are usually super cautious when we have sex cause I’m not wanting another anytime soon... but a couple days before I was due for my period we had sex unprotected... didn’t think I was ovulating so I don’t think I could be pregnant..