I still have not had mine and my daughter is three months but I nurse. I have not heard of a woman had formula feeds not get her cycle. Have you called your doctor yet? Maybe they know why you have not gotten your period yet. They can do a bleed pregnancy test at the doctors office.

I formula feed had a very light period 2 months PP.

I breastfed, but didn't get my first period til 8 months, even though I weaned my son at 6.