Yes happened to me! I was breastfeeding, pumping the whole sha bang. Got my period and could barely pump 4 oz all day. So I started supplementing. Now I have hardly any milk
I started taking a calcium plus magnesium supplement from the day I ovulate to the third day of period. I take 1500 mg a day. It's helped a lot. My milk supply has come back when my period is over though, and I believe that's usually the case.
Just had this happen to me and I freaked because I didn't expect my period at 13 weeks pp! I'm two days into my period and it's already getting better. I didn't supplement though, just fed every 2 hours and dealt with a frustrated baby when the breast emptied too fast. I'll try the calcium next month for sure!
Re: Milk supply and periods