Cramping on antibiotic

💕

So I have been taking an antibiotic called amoxy-clav for 4 days and I have noticed today that my lower back has been crampy.

It doesnt feel like a muscle it feels like a period cramp but I dont have a period yet because I had a baby 8 months ago and was on the mini pill and stopped it at 2 months pp

I googled side effects because I have never had an antibiotic do this before but any thoughts? 😖😖