Ovulation symptoms

I’m confuse, I always get blotted, nauseous, a bit of pain and tired when I’m about to ovulate ... I think ... I do opks, but I’m always wondering when exactly I ovulate cause I have symptoms for a few days... i had a positive yesterday and today is negative again so... do I ovulate right when I get a positive? Today? Am I still fertile? I know Glow says I’m but I’m kind of confuse... I had sex yesterday, Sunday and Saturday... should I keep going? lol