Why was my period only three days?!?

Ttc for about two years & I take progesterone suppositories after ovulation and have been for about 4-5 cycles. Anyways, this past week my period was very light and only three days. Not sure if it's something to worry about but usually AF is at least 5 days give or take and a day or two of spotting at the end. Has anyone experienced this or should I worry? Starting to feel like I won't ovulate this month or something and after going on google it's made me think I have PCOS or something 😭 im sure I'm fine but I have had a few cysts through out cycles that come and go