AF due today.. 1st month on Clomid.

I took Clomid 50mg CD3-7 this month and got a positive ovulation test on CD 18. My period is predicted to start today.. had AF symptoms and negative hpts last few days. Tested this morning- negative again. But my symptoms of AF completely went away and now I'm having short nausea spells. Did Clomid throw off anyone else's cycle?? Anything similar?