Contractions?

Ladies, I am 38 weeks, and woke up with some lower stomach cramps, almost like gas pains. I fell back asleep, but woke up again with cramps still. I went and used the bathroom, but that didnt really help. They come and go about every 5 mins, last about a minute and a half. It sends shooting like pain down to my vagina, along with back pain, and I get very nauseous. Do these sound like contractions? Thanks so much!