Pain can be due to many reasons.
Ligamentous pain is common as the uterus expands. It affects both sides lower down the abdomen. It is typically worse on moving / walking.
Pubic diatheses occurs because the pubic bones separate a little due to hormones that cause ligaments to relax. It happens in all women but some feel it as pain. It is safe. Simple measures such as painkillers, pelvic support and adjusting of sleep positions can help reduce or cure it.
Pain during passing urine is suggestive of infection. Urine infection is more common in women and especially so in pregnancy. If untreated it may lead to preterm labour.
Constipation is common in pregnancy. This also can cause pain.
FIbroids are common in women. They are benign growth in the wall of the womb. Most women do not realize they have fibroids. In pregnancy fibroids may enlarge and cause pain.
Preterm labour is a major cause of pain. It is similar to labour pain but too early in pregnancy. The pain comes and goes. It may be accompanied by loss of water or blood-stained discharge. This requires urgent attention.