What is this? 36+4 days

Lizzy • I'm a first time mom to my handsome little boy who was born 8.26.17💙 he makes me incredibly happy. follow our journey and I'll follow yours!😘🙂

I've been feeling crampy I think.... all day off and on. Like it feels like I'm gonna start my period like those cramps/like soreness you feel down there before you start? Before the cramps get really bad you know? It starts late last night and have been kinda just hanging around off and on since then. They aren't painful but I can tell they are there and it kinda hurts. Could this just be my uterus stretching or?