Ah, normal lang yan mama, lalo na pag sobrang dami ng lakad! A few of my mum friends din nag-experience nito when they were pregnant and nag-travel, kaya as long as may rest ka na nawala na ang sakit at walang bleeding, you're probably just overdoing it sa activity. But since it's pregnancy-related pain, I'd suggest message your OB lang or check in on your next visit para sure, just to give you peace of mind!