Ovulating or left over semen

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Is this most likely ovulation cm or left over semen? We had sex this morning and my SO finished in me (were ttc) I didn’t track ovulation this month but according to this app it would’ve been around the 31st.. this app is usually accurate when predicting my periods but idk about ovulation.. I’m not sure it can be off by that may days