When should i stop taking the pill to get pregnant?

My partner and I have decided to have a baby. Ive been on the pill for about a year now and the last couple of months i have been purposly missing my period by skipping the sugar pills. This month is the second month i skipped my period which i normally would have had a week ago. But for a week now i have been breakthrough bleeding (only light on and off). Last night i missed a pill and tonight im now bleeding like i have my period. Why is this? Should i just stop taking the pill now? or should i continue taking it? and how long will it take for my body to go back to normal so i can try concieve?