Period while breastfeeding

Aaliyah

So I had my son 11/14 and I healed but then I had what I assumed was my period 1/21-25 but I wasn’t just giving him breast he had formula several times those days but now my period is 3 days late and he’s mostly on breast now and will maybe eat some baby food but it’s breast besides that I’m trying to figure out if if normal for me to have a period while not breast feeding but then to not have one the next month