Ovulating early

Have ovulated early (3days ish) and had sex on Saturday night, my fertile window, had I not ovulated early would have started, according to my calendar, yesterday. 
​I can usually tell due to a little pain in one side or the other of my stomach and an excess of CM over consecutive days. 
​We aren't trying to conceive. Freaking out a little and could do with a bit of advice/calming!