Low basal body temperature

I have been diagnosed with unexplained infertility. I have an 8 year old son, so I know I can get pregnant. pregnancy was all fine except he was a month premature. My husband and I have been trying for years for another. I have done 3 IUI. Next step is IVF. I bought an Ava bracelet and my temperature is low. With a tiny spike during ovulation but a much greater spike the week before my period. Anyone have a low basal body temperature? Like 95's and up to 97 week before period.

Thanks