GOING NUTS! Help a Cyster out!

Long story short! I was diagnosed with pcos in high school. I am married, my husband and I have been together for 6 years married for two. I am currently on metformin 3 times a day, folic acid a prenatal and my weight fluctuates. I have lost 20 pounds but I’ve maintained it since I lost it. We are TTC for #1 this is our first month on letrozole/femara 2.5mg and I was prescribed provers to induce my cycle if needed which I did need it for the month of August. I got three days of positive opk’s we baby danced every other day leading up to ovulation and used preseed. I am currently 8dpo and I have had lower pelvic pain and backaches on and off since after ovulation and my boobs are tender. I usually get tender boobs before my cycle but Its still early! I know it’s early but I tested this morning and got a Bfn. since my periods don’t always come on their own I will keep testing but I’m scared to take the provera to induce my periods to start the next cycle if hypothetically I am pregnant and it’s just not reading on a test. Because I know some people don’t get their bfp’s till 14 dpo. I need opinions please! Sorry for the long post!