25 day cycle ttc suffering from Luteal phase defect

So I always wondered how come it wasn't so easy for me to get pregnant and recently I discovered lpd is why. I started working out again and started taking prenatal pills prior to finding this out and recently I had sex thinking my af was over after 3 days. On the 5th day after intercourse i saw a few drops of light blood and like this can't be because of an std so I'm confused as to what it is. I think i might've ovulated too and I read about ovulation spotting. All i do is read looking for signs that i could be fertile or have early signs of pregnancy. I feel so anxious and desperate just to have a baby. It's really disappointing. Does anybody recognize any signs of fertility going through luteal phase defect?