Round ligament pain? - not pregnant

With both my pregnancies a very very early sign for me was round ligament pain off and on when I sneezed or coughed. Then it immediately went away after giving birth. Totally normal. Now I am almost 6 months postpartum and all of a sudden experiencing round ligament pain again, just here and there when i sneeze or cough. My first thought was a new pregnancy but my tests were negative. My period came back (with a vengeance) at 7 weeks pp but I havent had it again since. Im still breastfeeding my youngest so my cycle is all wonky. Im also experiencing random burning sensation in my nipples, which ive chalked up to a side effect of breastfeeding although they are not dry/cracked/poor latch, and extreme hunger. Both are out of the ordinary for me and only started in the last week. So i guess im wondering - is this all normal? Can you have round ligament pain when youre not pregnant? Is it all in my head or is my body doing something weird? Thanks for reading and sharing your thoughts!