Always had a 28 day cycle and got pregnant on day 13 with DD and again on day 13 with Angel Philippa (05.04.05).Had on/off post pregnancy bleed after Philippa and periods eventually started again on 01.06.05. Had a go on day 13 (wont do it other days,as it worked before like this,superstitious nonsense i know) and period arrived day 31.So seems cycle is now longer and this month gonna do it day 13,15,17 and 19.Think that will be ok??