Normal or should I be worried

After eating my breakfast this morning I instantly felt nauseous and queasy like I was going to throw up. So I tried to breathe through it and it went away but now I'm cramping in my back and it feels like menstrual cramps. They're dull and achy and just constant. But nothing I can't handle. I am 37 weeks and wondering if this is normal for me to feel? I almost felt as if I was in my 1st trimester again with morning sickness.