Aw first time mom jitters, totally get it! That sensation sa loob ng tyan mo is usually the ligaments stretching as baby grows, super normal, pero yung soreness ng dede especially if may parang swelling inside, best to check with your OB just to be sure kung normal pregnancy changes lang or something else, kasi bawat pregnancy talaga ay different. A few of us had similar worries and when we mentioned it sa doctor, nag-relax lang kami knowing everything was okay, pero important talaga na confirmed ng professional para sa peace of mind mo, especially first time. Ingat ingat lang and don't hesitate to reach out sa doctor, better safe than sorry!