Af coming or implantation?

Tanya

I am in my peak ovulation days and had unprotected sex Feb 9th. According to clear blue ovulation predictor I am positive and suppose to be at my peak feb 10th and feb 11th. Glow Ovulation day predicts it being feb 11th. But today (feb 11th) I am cramping in my uterus with bubbly gas feeling, and low back ache, did I ovulate early? is my period coming early? Trying to figure out why I am having AF cramps and feelings a day after and on ovulation day or could it be implantation? ( sorry for being all over the place with this I’m just confused).