Is gas a symptom at 5 weeks?

This is really weird but I have really bad gas pains right now but I've barely eaten due to being nauseous most of the day so I know it's not from something weird I ate not agreeing with me. I've had mild period like cramping but this is like doubling over gas pain! I've also been constipated for a few days now awhile. Is this normal? What can I do to help with this?