Oo normal yan, mama! At 23 weeks kaya na ng uterus mo mag-contract, lalo na after intercourse, talagang may tendency tumigas ang tyan dahil sa hormones at physical stimulation. A few of us tried din before at nag-panic kami first time, pero as long as walang bleeding, cramping, or unusual discharge, it should pass after a few minutes to an hour or two. Pero para sure at peace of mind mo, mas okay pang i-check sa OB mo next visit or anytime you're worried, lalo na first time mom ka pa lang.