Discharge help

I've been getting this milky or watery

pale/foggy yellow discharge for about a week now (or since I ovulated) and my period is 10 days late. I don't have any symptoms of a bacterial infection and haven't been sexually active. Has anyone else experienced this & can give me some advice/experience talk? Or tell me what it is?

Ps. The picture is what it looks like dried up in my underwear obviously