Cramping due to ovulation or pregnancy?

Kaitlyn
Today I woke up with annoying uterus aching my back hurting and my nipples sore while nursing. My period isn't due to make its grand entrance until the 3rd. My fertile week was estimated to be February 13th to the 19th. I had sex on the 14th and last night. I checked my cervix every single day this week I definitely felt a very open soft high cervix on the 15th the following day it was lower not as open and not as soft the cm was tinged with a tiny bit of blood. I can't tell exactly which day I ovulated but my charts say the 18th. I have never tested this early. Idk if I even should. Do you usually get pregnancy symptoms immediately following ovulation? I never paid attention before but now that I'm ttc I am watching everything!