My boyfriend and I had unprotected sex April 25-28 , two or three days later I experienced cramps . Very mild cramps on my lower stomach and down to my right leg . They just went away today . I also have pain on my lowrr stomach when I out pressure on it .. ? ... I'm very irregular so I wouldn't know anything about when my next period would come . My last one was about two months ago . I've never had cramps , only when my period came . But that's not the case right now .