Ovulation or sperm question?!

Alright I made a poll and got mixed answers and it confused me lol so I'd just like you to commet please.

Ok so this app says I ovulated from the 25-31st but on a few other apps they all say I ovulate until the 2nd... On cycle day 15 I got alot of this stringy clear cm which was oct 30th. We had sex early this morning at like 2am, he finished in me, I cleaned up with a napkin(sorry tmi)and went back to bed. When I woke up at 6am, went to the bathroom and when I wiped there was still some clear stringy cm.

Could it be his sperm or me ovulating now and the App was wrong?!