I'm 17 weeks pregnant and last night started getting a backache which I've heard is very common in the second trimester but I'm also sorting of getting like a contraction/crampy feeling in my lower abdomen. I wouldn't say it's as bad as period cramps but I'm a bit worried that the combination of a backache and stomach pain could be associated with a miscarriage. I don't know if I'm overreacting or if I should go get checked up