Sometimes. The third trimester is also the time when those intestinal issues pop up again, so it is hard to tell. If you are having more than 4 contractions in an hour, even if they don't hurt, you should be seen by your care provider.
Yes it can but dont use that as a symptom, Contractions or spotting is more obvious ones. Gas and naustea can be like a side effect from it since you have pressure during contractions which could make you feel sick or gassy.