Could you be pregnant if you started your period on Friday and it ended on Saturday and you are trying to get pregnant or could it be from coming off the pill over a month ago?

Very unlikely because it usually takes more than a couple of months or more to fall pregnant after you stop the pill. The reason your period may be irregular is because your hormones are a bit 'out of whack' from the pill and are slowly returning to normal. Also with me if i have sex about a day before my period is due it only lasts for a day then stops then starts again. On average it takes 3 months - 2 years to fall pregnant after going off the pill but then again I'm no doctor! Tell me how you go.