Ebf first period pp weightloss

Hello mamas. So I’ve been meaning to ask if anyone has lost weight after their first period post partum. I hadn’t lost any weight aside from the initial weight loss from my baby and placenta. Prepregnancy I weighed 138lbs. I got up to 173 at the end then at my 6 week checkup I was at 159. I’m currently 16 weeks pp and I got my period last week. Breastfeeding hasn’t helped me lose weight as quickly as I thought it would. I actually gained a couple of lbs and was at 164. But after my period I was at 155lbs. And now a couple days later I’m at 151lbs. So in this last week I’ve lost quite a bit. Im wondering if anyone else has had this happen. I’m still exclusively breastfeeding btw. I’ve also read about an increase in weightloss while breastfeeding at 3-6 months. Just curious if any of you have experienced this as I’ve still got 13lbs to loose until prepregnancy weight.