Pregnant?

Last night, I decided to go out and have a couple drinks. I've kind of been feeling sick lately, like morning sickness, but I thought I was just over thinking the situation. I got my drink and went to sit down. About 5 sips in, my stomach started churning. I gave the drink away and just got a water, thinking that maybe my stomach would stop. I had gotten one more drink later on, thinking it had passed, and about 5 sips into that one, and the same thing happened.

I don't know if your alcohol tolerance can take a hit like that or not, because if I am pregnant, its been 4 weeks since conception. Any thoughts?? The test I took this week was negative.