7 Weeks!

I had my daughter 2/11 and I waited the full 6 weeks before I had any sexual intercourse. I just did it the last 2 days and used protection. I breastfed my baby for 3 weeks after She was born before I had to stop due to problems. I haven't had my period, but the past 3 weeks I've felt period like symptoms. Can the breastfeeding still have had an affect on my period? Thanks in advance!!