Spotting early after switching pills

Your cycle is probably thrown off by the change in pills and then on top of it not taking it on time. Generally if you count 14 days from your 1st day of LMP that is the approx "fertile date"... ovulation occurs approx 72 hours before that... Implantation bleeding if you have it at all can happen about 1-2 weeks... 7-10 days ish after the "fertile" date... They say that by the date of your next period you are according to charts 4 weeks pregnant. Does that help??? your question didn't specify what they dates were... sorry hope it helps. Please tell all the men in the world "pull out method" is not 100% since there is precum...