Bad cramps at night?

It only seems to happen at night. Like they aren’t bad bad i can tolerate them it’s just really uncomfortable. No bleeding or anything. My midwife doesn’t seem too concerned. My uterus gets really tight too. It usually last less than ten minutes then it comes and goes for another 20-30 minutes. Or if i change positions or get up too quickly. It’s been happening for like a week now. I still feel pregnant. I guess it’s just normal pregnancy stuff. It’s been four years so i don’t remember none of this lol. My second trimester starts Saturday so hopefully I’ll start to feel better.