What Causes Frequent Urination Along With Headaches And Cramps?

I think I may be pregnant, and if I am, it feels ectopic. The date of my last period was 10/2. My DH and I had intercourse on 10/8 and 10/9, using the pull-out method. From 10/16 to now, I have been nauseous, I ve had the same steady headache throughout these days, my urination is more frequent, my breasts are tingling on the inside, one of my areolas is darker than the other, and I feel cramping on my left side. If I am pregnant, I believe it is ectopic because I feel pain near my hip. But I also feel a dull cramping near my uterus. My period runs on a 24-26 day cycle, and today makes day 24. Can you help me figure out what may be going on? Thanks in advance!