Regular spotting before period

I am 38 and ttc. I have a history of irregular cycles, but I was extremely overweight. 18 months ago, I had bariatric surgery and have lost 165 lbs. I am still overweight (5'1'" and 166 lbs.), but much less so. After surgery, I had the implant for 12 months because it is dangerous to conceive so soon after surgery. I got the implant out 6 months ago to allow my cycle to normalize for a while before ttc. Anyway, my cycles have been very regular, but very different from before the weight loss. I now have a 26 day cycle with a 13 day luteal phase. My concern is that I start spotting about 5 days prior to each period. Spotting is light, but thicker in consistency and brownish. It is only noticeable when I wipe. From what I gather, this can be due to low progesterone. (Interestingly, I spotted nearly every day with the implant, which is progesterone based birth control). Anyway, I was just curious if anybody else who regularly spots this early has gotten pregnant and what supplements/medications people have found helpful. Thanks!!!