Early pregnancy symptom?

I've had sex multiple times this month before and after ovulation. We used pullout on most fertile days. I am aware that's not reliable at all and we won't care if we happen to be pregnant. Having said that, did anyone else notice nausea only after drinking? Two nights in a row (Friday and Saturday)I only had one glass of wine and immediately felt sick. This is not normal for me and am a somewhat regular drinker. I haven't drank since then. Period is due today and yet to show.