Charting has been impossible for me with my cycles coming and going as they please. By the time I have fertility signs, it could be too late. Say I ovulate on cycle day 18, and have signs of fertility the day before BUT had no signs the day before that and so had sex. I could still get pregnant. Sperm can survive for days. (ask me how I know! LOL)
I had been charting for 10 years and so when I say charting is not an option I very much mean it.
Last week I was in the hospital, it seems I have a heart condition and a few other things making another pregnancy right now life threatening to me. (Not that I am allowed to have sex right now anyway!) But when we are able to again I am certain I want to have something solid for birth control.