okay so, once in a while when I'm out of my fertile window and close to my period I let my so finish inside (tmi) & afterwards, usually the next day, and until I get my period.. I have cramps. not really bad cramps, but like a little nudge once in a while, because they don't last long like period or ovulation cramps. is this normal? does anyone else experience this after they let their so "do the deed" inside? (and btw I know they're not implantation cramps because I have yet to get pregnant while out of my fertile window, but I thought they were at first)