Question

So dis week I been fertility and last night me a my fiance had unprotected sex and so I hear if you pick your legs up in the air so the sperm can flow throw and after I did that I started cramping and I was nauseous and dizzy and we had unprotected sexy like 2 hours ago and I did the samething put my legs up in the air and I started cramping again and I was nauseous again I could eat nothing by the way my ovulations day is today and What it mean