Nausea around the time of ovulation???

I have been having a crazy cycle this month. My Ov date was much later than usual. I typically get a positive opk on CD16 or 17. This month it didn't come until CD22 which I chalked up to the sudden increase in activity level (hubby and I started remodeling). But then, yesterday (the day of the positive opk) I started feeling really nauseous in the evening, even before doing the babydance. Today I have been experiencing waves of nausea too. It doesn't feel like food poisoning. This is so not normal for me. I rarely feel nauseous. Has this happened to anyone else??? Idk if it's hormones or what. I'm not taking Clomid or anything so.... not sure what this is. Anyone have ideas?