Confused on my body

Lana

So my period ended the 15th, since a couple of days ago my uterus has been aching & im sore down there...no discharge,discomfort or itching. I believed it was a UTI but was ruled out at patient first I hold my urine a lot due too not wanting to wake my son with getting in an out of bed. I’ve just decided to continue my cranberry pills at home, but am I tripping or should I go too the ER??? The pain is mild more so cramping if anything