Ay, nagaalala ka talaga, I can feel it! But honestly, period changes like that can happen, stress, hormones, diet, exercise, lahat pwedeng mag-affect ng cycle, especially kung sudden yung change. Since you're still cramping and the flow stopped early, best to check with your OB para ma-rule out anything and get proper peace of mind, kasi kahit negative ang PT, good na makita ng doctor para malaman ang totoong cause, a few of us moms had similar scares and it turned out to be just hormonal imbalance or stress lang. Fingers crossed it's nothing serious, pero don't wait too long ha!