Cramping my god!

Katie • 27 years old. Me and my husband have a 4 year old and TTC #2!!
So I slept until 10 am today (it's now noon), highly unusual for me, and I have had this cramping in my lower back that is pretty consistent, it eases up some. I don't think my stomach is getting hard but I can't be forever sure if it feels harder than normal. Any advise? Idk if i should call the doctor or wait and see what happens?