When should I get off the pill?

I am on the pill as of the moment. We are going to start TTC with baby #2 in May. I was curious when I should start to get off the pill. I was planning on getting off after my period in April, but I wasn't sure if that is enough time to let it get out of my system. I also don't want to get pregnant before May so I don't want to get off too early. I had the arm bar before I got pregnant with my son. I had one period and was pregnant the next cycle. I wasn't sure if it would be the same way with the pill. I plan on asking my doctor, but I am currently in between doctors due to my insurance changing.