Ava bracelet

Hi guys, I know I am not pregnant but wanted advice from plus sized and pregnant ladies. I am plus size, I have been TTC for years over the last 5 years or so, I have been extremely regular and normal periods. My husbands sperm count has been checked and he is fine and I do not have any other problems getting pregnant and was fobbed off by the DR. So I am wondering did any of you guys use an ava bracelet, I just think it is a lot of money if it is a waste of money.