Week of ovulation but am not trying this month.

I've had two chemical pregnancies in a row. One end of May/early June 2018 which took my body forever to recover even tho it was a chemical pregnancy and barely 4/5 wks. I didnt get an actual period until Nov 2018 almost 5 mo ths later. I ovulated Early Dec. Had sex during my fertile wk. Got pregnant mid Dec. Was Super excited and told my very close friends i was so excited. It ended up being another chemical pregnancy/miscarriage. So sad and depressed. I thought for sure i was blessed with a miracle Christmas present. I feel like why bother trying anymore....they don't stick. I'm 37 yrs old soon to be 38 in a few months. Sigh.