My boyfriend and I had sex on December 28. The last day of my ovation which it was at 22% chance of me getting pregnant. And the 28 with was 8%. I haven’t missed my period, but my January period wasn’t like it normally is. I haven’t had my February one yet. I am a pretty active person and I read that that could be a factor. But this week my back as started to hurt a little, I’ve been feeling a lot nauseous, I am pretty tired and I am constantly hungry. Does any i this suggest that I could be pregnant?