Aww congrats sa pregnancy mo! Rashes sa groin area during pregnancy are actually pretty common kasi sobrang init at humidity dito sa Pinas, plus the hormonal changes, a few of us moms had the same issue, super frustrating talaga. Best move is to check with your OB agad para sure kung anong type ng rash siya (sometimes it's fungal, sometimes just heat rash) kaya they can prescribe something safe for you at baby. In the meantime, keep the area dry, wear breathable cotton underwear, and avoid tight pants na makakainis pa, pero definitely let your doctor confirm first para peace of mind mo!