What’s the latest you got your bfp followed by a bunch of Bfns?

So my situation is that I’m currently 15dpo but have only gotten bfns. Not even the crappy blue dye tests resembled a bfp 😂 but it only confuses me because I have lean PCOS. Instead of having incredibly long cycles mine are incredibly short. Most times I pray for my period to just make it to 28 days before I bleed. Last cycle I was super upset because I had opks give me a clear positive and I kept taking them after to make sure they were lighter and they were. But I bled 8 days early. This time according to Ovia I’m 4 days late and glow I’m 2 days late. I’m also unsure of exactly when I ovulated. I don’t really have any symptoms of anything other than a killer two day headache that started yesterday and barely noticeable cramps. I could very well have her show up this weekend but I’m never late always early or right on time. I also started shatavari root a couple of months ago which gave me a perfect on time period last month (it was two cycles ago I used opks and bled for two weeks) and I bled gloriously normal. Any thoughts comments opinions would be greatly appreciated and yes I go to my Gyno for this our goal currently is getting my cycle normal and trying to conceive naturally because she believes I’m capable without meds yet. She’s aware of every little thing my body goes through. I also quit drinking a year and a half ago and wonder if the mental stress that comes with that has affected my body and wonder if I just relaxed and had a few every now and then if maybe I would conceive 🤷🏻‍♀️ it happened years ago but ended in mc.