Positive OPK 3 days straight?!

Ashley
I haven't had a period since February. (4 months ago) I'm irregular. 2 days ago I checked my CM because I felt "wet" and took opk it was positive. This is the 3rd day and I'm still getting positive opk, my nipples are sore right now. I'm confused? Am I getting my period soon? Or am I pregnant? I've heard you can use opk as pregnancy tests?