??? About sex??? And ttc #1

Chassity
Ok so has anyone had your partner tell you your extremely hot down stairs while inside I don't know much about body temps but he said it was different way different from any other time... I kinda feel like I'm cramping a bit AF is to be this month on the 2-14-17 I'm on day cycle 18.. Has anyone experience this if so why?? Any and all insights would be nice