Weak stomach or Pregnant?

My fiancé and I have been TTC for 6 months now. Unfortunately haven't conceived yet. My period is due in 6 days, so I'm too early to test, but I have gone out drinking the past 3 nights and wake up miserably ill. I puke all day and even after eating and it being 24 hours since I drank, I'm still nauseous. I didn't drink in excess.

I had awful morning sickness in my first pregnancy but it didn't kick in until 6 weeks. This feels similar but could it be possible when I haven't even missed AF yet?