normal or not?

ivana
so lately from time to time i start feeling slightly lightheaded and nauseous, and start sweating. and it happens in the afternoon, while i am sitting down. and when it happens i just want to take all my clothes off and have a cold shower to cool off and breathe.
i'm 31+5 and live in a tropical climate (very hot and humid).
should i be worried or is it another normal pregnancy thing?