Does anyone on here use the Daysy fertility tracker?

I’m not currently on birth control, but I’m too scared of going on any type of contraceptive. Obviously they all have one great pro which is preventing unwanted pregnancy (if they work as intended) but they all have some pretty serious side effects that you may or may not experience but never seem to find out until you’re actually on them. Ok I’m rambling now but if you use the Daysy could you please share your thoughts and experiences using it. Thank you💕💕