I have been using this tracker and its really good and damn accurate. also for busy females or they are just bad in maths, well for them this one is really helpful. The data are always accurate and also its easy to follow my fertility tracker. Its easy and simple , along with easy wearing make it helpful on a different note.
The women's fertility tracker and the real-time sensors are really good too. I recommend you this, its really helpful and i am personally using it for while so yeah its really good
It also has pregnancy tracker too so yeah , all ladies, go for it!