Ovusense & Ava Bracelet

Does anyone have experience using one of these? I'm thinking about buying one of them but I can't decide which. With Ovusense, you put it in your vagina while you sleep and it tracks your temp then you download the data to an app to track and Ava is a bracelet you wear while sleeping. I can't remember the cost of Ovusense but Ava is like $200-$300. I'd like to hear everyone's experiences.