What should I use?

So I have sex almost every day with my so and we have used condoms every time but we have been less persistent with them bc they reduce pleasure for us. I’ve been only having unprotected sex after day 18 of my 26 day cycle. But i know there is still a risk so i have started taking my temp everyday and charting. Is this enough or do you recommend going on the pill? Has charting been an effective birth control for anyone?