Panadol; in fact so is Panadeine Forte in pregnancy provided it is under the supervision of a GP. They're both class 'A' drugs - safe for pg.

I had the cramps significantly around the time my first & second AFs would have happened post BFP. Freaks you out, but only really something to be concerned about if in conjunction with bleeding or severe pain.

Oh, just make sure you stay away from Asprin!