Spotting/Possible hormone imbalance?

I've been TTC for 6 months. I saw my dr 3 months ago because I didn't get AF after I stopped taking the pill (I was on it for 10 years). She did a blood test and my thyroid and prolactin levels were normal (she tested for something else too but I can't remember what it was). Dr didn't think I was ovulating yet. She said I was probably not getting a period because I'm a little underweight. I don't think that was it because two weeks later, AF came on its own (3.5 months after BCP). After another long cycle, I started Vitex, ovulated, and had AF. I'm still taking vitex, and my cycles are much shorter (35-40 days).

This month, I had brown spotting on/off from 4-7 dpo, accompanied by mild cramps and a slight "burning" sensation near my uterus. I have never experienced that in my life! I thought it could be IB, but I've been getting BFNs. 😫 I'm only 10 dpo today but I'm thinking this is not our month. Plus bbt dropped.

I've read that spotting could also be a hormone imbalance. Now I'm wondering if that's the case. In addition to a wacky cycle, I have always been prone to break-outs, get frequent headaches, and have really erratic bbt.

This may be a dumb question, but can the dr test for other hormones in the blood? Since everything was "normal" before, I am confused. I'm hesitant to run to the dr for every little thing because it costs $97 per visit with my insurance. The spotting concerns me though since that's not normal for me.

Thanks!