Please help.. ovulation cm or left over cm??

Does this look more like ovulation cm or left over semen? According to my app I ovulated on the 31st (that could obviously be off)

My last cycle was 24 days and it’s 9 days until my next period is due.. is it possible to ovulate this late??

we had unprotected sex this morning and I had this tonight. Could I be ovulating late? Or is it left over semen