LOST BIRTH CONTROL

Hey guys i was on the mini pill for 3 months bc inwas breastfeeding. i was about to finish my pack but on sunday i noticed that i had lost it. So on sunday i didnt take a pill. And yesterday i went to get my new pack but i got the combination pill bc i am no longer breastfeeding. So yesterday i started my new pack. And today i am bleeding again for the 3rd time this month. Is that normal?? maybe just bleeding from not taking the pill?