Before missed period?

I am not sure if I've missed my period or yet i stopped keeping track of my period, and now I am because I have a bad. But I missed 3 days of birth control during my peak ovulation days. This is going to be the second week from then, so I don't think I've missed my period yet. But has anyone had like an upset stomach or nashea before missed period? Or just feeling off? I've been extreme more irritable than my normal pms, and I stomach just has been feeling weird the past couple of days. Yesterday I actually got sick at night out of no where.