Pain in pregnancy can be expected but it should not be seen as normal..
Your health provider should be notified if there is:
Vaginal spotting or bleeding
Unusual vaginal discharge
Chills or fever
Pain or discomfort while urinating
Nausea and vomiting
According to Babycenter.com, “it is not normal to have cramping during pregnancy with pain that’s severe, persistent, or accompanied by other symptoms, such as nausea, vomiting, vaginal bleeding, headache, or fever. Pain with cramps and vaginal bleeding in early pregnancy can be a sign of ectopic pregnancy or miscarriage”.
Not Normal: Pain in Upper Abdomen
It’s also not normal to have any pain in the upper abdomen. And if your abdomen is unusually sensitive to touch, especially when pressure is released, a serious abdominal infection (peritonitis) could be the culprit.
Normal: Gas, Bloating and Constipation
Gas and bloating can occur due to because of hormones that slow your digestion and the pressure of your growing uterus on your stomach and intestines.
Similarly, constipation can happen due to that change in hormones during pregnancy.
The Baby Center also notes these other situation which will cause pain.
“Cramping during orgasm: You may notice a bit of cramping during or right after an orgasm. As long as it’s mild and short-lived, it’s perfectly normal and nothing to be alarmed about.
Round ligament pain: Round ligament pain is generally a brief, sharp, stabbing pain or a dull ache that you may feel on one or both sides of your lower abdomen or deep in your groin. It usually starts in your second trimester when the ligaments in your pelvis that support your uterus begin to stretch and thicken to accommodate its growing size.
You may feel a short, sharp pain if you suddenly change position, such as when you get out of bed or up from a chair or when you cough, roll over in bed, or get out of the bathtub. Or you may feel a dull ache after an especially active day. Call your provider if this discomfort continues even after you’ve rested.
Braxton Hicks contractions: After midpregnancy, you may start to feel a tightening sensation in your uterus from time to time. Before 37 weeks, these Braxton Hicks contractions should be infrequent, irregular, and essentially painless. (Once you’re close to your due date, this type of cramping during pregnancy can be a sign of labor.)”