Overthinking? Appreciate HELP!!!

Right... 2months ago I had sex (pull out) a week before AF. Period came and it was lighter but still lasted 7days.
 1 month ago my SO put it in me for no more than 5seconds and we stopped because I was fertile. But I got my period and it was clotty and really heavy as usual lasted 7days. 
Since the past 2 months I've been crampy and bloating and had veiny boobs on and off between periods? Could I be stressed of overthinking or is it possible that I'm pregnant?