Natural birth control advice!

So I got off of the pill because it made me sick and I just don’t want to be on it.

I have a regular cycle, BUT have never needed to watch out for ovulation days, do to being on the pill or using condoms .

I’m wanting to learn natural pregnancy control ways from knowing my ovulation days.

I am not too worried if I got pregnant, because I am married, and I wouldn’t mind having another baby ,but also I want my son to be a little older, ect!

SO the question is, can he come inside as long as it’s in the black days on our cycle calendar when using this app?????

Thanks