Could I be?

So my LO is a little over 2 months old. Me and my SO have had sex three times. Once before the 6 week mark and at 6 weeks I had my period. We had sex two other times right before my fertile window via eve app and used withdraw (not our smartest moment). Over the past week my stomach has been very crampy and it seems nothing really helps it. I’ve tried gas relief/laxatives, Tylenol, and walking. Is it possible I could be pregnant. My SO said it jokingly but now I’m worried.