Cramps really early?

Steph
My LMP started on 5-22. I had a (-) opk on 5/30 and (+) on 5/31. The last day I've seem to have to tinkle more often (no pain) and now having cramps like I would for start of AF, but still really early for that. Cramping on my right side, which happens to be the only ovary I have; lost left one a few years ago to tumor.
Anyone have weird cramping way off schedule?