I got AF Sept. 17th-23rd. I had sex the 23rd, 27th, 28th, & 29th of September. My fertility week starts Oct. 6th-12th according to this app. My menstrual cycle is 38 days long so my next period isn't due until Oct 25 according to this app. Well yesterday & today I experience some light pink spotting. I know if my menstrual cycle was 28 days I would have ovulate on Sept 30th. I'm just so lost, I dont understand why I'm spotting around this time. I need some answers lol. Helpppppp!!!!!!!!!

Edit: Today, Oct 2nd I'm experiencing a little discomfort in my lower stomach, not so much of cramps tho.