Wondered if anyone's heard of Ava or tried it? It had all good reviews

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Stumbled apon this on Pinterest and wondered if anyone's heard of it or tried it? It had all good reviews. (Only 7)

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I have it. Been wearing it for almost a month. It's very easy and stress free. My first month it was off from my opk by about 3 days but they said that's because it's still learning my body. The company is amazing and has great customer service and responds to everyone very quickly.

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I ordered mine and can’t wait!

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I just got my bracelet after a 3 month wait. Had it for 1.5 weeks now. Hasn't predicted my ovulation yet but I received it just a few days before my ovulation date. It temps wrist temperature so it's about 1-2 degrees Celsius lower than temping orally. For me, temping orally was too nerve wracking to sleep min 4 hours and temping first thing. Now I can just relax and get up before temping. The strap is flimsy and feels like it can break. For $200, it's a bit pricey. But for me, temping otherwise is just too much of a hassle because I get up at odd hours of the night and worry that I have to temp whenever it's been 4 hours of steady sleep.

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I'm selling mine if anyone wants it

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I had mine for 2 months and it just stopped working (won't charge or anything) last week. Emailed them but haven't had a response

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Just ordered one, hoping it works for us!! 
Here’s $20 off referral code:
http://avawomen.ref-r.com/c/i/10619/6997528

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I'm so curious,  I've never seen it, Im not ttc as Im pregnant but how does it technically work?