No period 3 months postpartum and not breastfeeding

Patricia • Fri, Jul 05

My baby is over 3 months old now and still no period. I only Breast feed a few times during the first 6 weeks and had sex on the 7th week. Took a pregnancy test a month ago and it was negative. What is going on???? NEVER had this issue with my other 3 Kids 😩