Like the post above says it can be round ligament pain. I had the same thing when I was pregnant. Your body is starting to stretch in ways it never knew it could!!! I had HORRIBLE hip pain when I slept in the first and last trimester. I could hardly walk the next morning. In the beginning it was from my hips spreading apart. Congratulations and I hope you have a healthy pregnancy.
Could be rround ligament paint. Due to stretching of the uterus, or a uti can cause cramping/ abdominal pain. Where exactly is the pain? Right by your hips?