Yes, and your stomach tightens. I'm 34 weeks as well, and was having some contractions. Make sure you're drinking plenty of water, that's what was causing mine.
Contractions will harden your WHOLE stomach and be accompanied by pain in your lower abdomen (like period cramps) or in your back. If your belly is getting hard with the pain it could be a contraction, otherwise it is probably just your body stretching stuff out to make room for baby.