help! when do I give up?

Lauren • Mama, wife, Christian. Diagnosed w pcos 8/2018. 👧👼🏻👼🏻👼🏻👦👧👼🏻🤰🏼
I just went through a miscarriage 3 months ago. Unfortunately it was a long drawn out process. Bled for 6 weeks until finally getting a d&c. At two week post appt my dr said she thinks I could be ovulating bccof my symptoms, so my husband and I went home and tried the next 4 days. App says ovulation was June 10, who knows if accurate. I thought I got AF last Thursday which app says is two days early, had two days of spotting with red and brown blood, some small clots. Then have been utterly exhausted, want to eat everything in sight, and even had heartburn one day which I never had unless pregnant. I want to believe there's hope this month but when should I give up? I've tested every day and every test has been negative. I'm new to this as my other two pregnancies were surprises. Help!