I have been on different pills for the last 12 years on and off (more on than off) First I was on Marvelon for a couple of years, then I went on to Celeste for a year and then went on to Dianette. I was on it for about 7 years and came off it last May. Ttc since January but periods have been quite erratic. My cycle seems to be long (about 40 days on average) and not particularly regular although my last two cycles have been slightly shorter. Should I be concerned or is this fairly normal after coming off Dianette? Getting a bit dispondent now. How soon should I pay a visit to the doctors?