No period 5 months after nursing? 🤷‍♀️

Elizabeth

I EBF my son for the first 6 months. I then made the switch to formula as my supply was dropping. It’s now been almost 5 months since I’ve stopped nursing and my period is still not back. I was on the micro pill while nursing and then switched to Lo-loestrin. I’m definitely not pregnant, even took a test to confirm! I’m going to call my doctor to see if this is something to be concerned about but was wondering if anyone had experience with this. How long did it take your period to return after breastfeeding?? Thanks in advance!