Could I be pregnant or is AF sneaking up?

I never have normal cycles. Sometime I'll skip a whole month at times. My last cycle was May 4th-8th. We've been TTC (baby # 2) && had positive opk's the 18th-22nd. I've been feeling really sick the past week or so. The feeling I have to throw up. No sore breast or anything like that just been sick to my stomach. Today I've had really bad pains when I stand up. Even when I walk they are worst but when I lay down I'm fine. Could I be pregnant?? I got a BFN about a week ago. That was the last time I tested. According to GLOW AF was suppose to be here June3rd