65 days no period.....long post

I had my daughter feb 2019..I am exclusively breastfeeding her was on birth control for 3 months may to July and after i stopped birth control my periods were coming normal then they just stopped and 3 times in the last few months that I haven't gotten my period.. only one day when I pee and wipe I'm spotting but after that nothing... I have gotten blood test urine test they all come out negative... I'm kind of losing my mind.... would love some input