help!!! What's going on!!

Ok so my last period was Dec. 2-7. I don't suppose to get my period until Dec. 30, my tracker tells me that I was ovulating on the Dec.16. I've read that breast soreness is ok during ovulation but the part about that is, I'm 24 and out of the 13-14 yrs I've had my period (matter of fact every since I've had a period) I've never experience sore breast during ovulation. didn't even know I could even have that during OV time. but anyway, like i was saying, my ovulation was said to be on the 16th soreness started on the 14th and it's now the 20th and they hurt more than usual, I have had lower stomach cramps and vaginal cramps. Idk if that's a sign of pregnancy or if that's just telling me I'm going to have a early period. help please. it's weird because I've never experience these things 2 weeks before my period