Thank you for posting your question here, I will try to answer it to the best of my abilities.
Well you could just use avoid having intercourse on the days when you are ovulating, it is one of the easiest methods of contraception
if you have a regular period that is, if you have an irregular period it makes it slightly harder.
This is how you calculate the days on which you are ovulating, add 14 days from your last period, the next 4 days after that are the ones when you ovulate.
So if you avoid intercourse for those 4 days, you're safe. If you want to be extra safe you can make it 7 days instead of 4, that way you have some margin for error.
I hope this answered your question.