alcohol intolerance pregnancy sign?

Anyone here suspect they were pregnant from not being able to drink as much? I can usually drink a whole lot and not feel sick or get sick but the last couple weeks I've been scared to drink because I get wicked sick and have hot flashes. I didn't think anything of it but last weekend I was so tired and could barely keep my eyes open and I've been looking it up and for many people it's been a sign they were pregnant.