Breastfeeding can I get pregnant again?

IvyRose • Mommy of 3💙💙💙#babyboys Ariel ,Axel and my newborn Abram

Im 10 weeks postpartum and me and my husband had unprotected sex and I think I got my period a week ago but only lasted 3 days and very light to nothing I have been Brest feeding every night and 3times day Since birth but I also do formula .can I be pregnant he did ejaculate inside me ? Today will be the third day after it happened