Pregnancy test.

Alyshia • I`m 17. My husband is 21. We have lost two babies, and we are going to keep trying until we get a baby. We have been together a year, and married for three months.
When should I take a pregnancy test? I'm fertile August 1-7. Ovulation day is the 6th. I'm supposed to start my cycle the 22nd. Just looking for advice. Help. No negative comments please