Congrats sa buntis, mama! Generally okay lang ang 4-hour land travel at 7 months kung walang complications, pero it's really best to confirm with your OB muna kasi bawat pregnancy is different, a few of us tried long drives at that stage and okay naman, pero may isa sa group namin na doctor advised her to avoid it dahil sa her specific condition. Make sure may comfortable seat ka, frequent stops para mag-stretch ng legs, at stay hydrated talaga, at kung may sudden cramping or anything weird, go to the nearest hospital agad. You're doing great by checking muna!