Ay, mommy, I really think kailangan mo ng checkup sa doctor ASAP para malaman talaga kung ano yan, hindi safe mag-assume sa ganitong situation, lalo na 4 weeks ka pa lang. A few of us moms learned the hard way na mas better mag-consult ng OB agad than worry lang, kaya please don't delay, okay? Tell your doctor exactly what you're seeing so they can check properly. Praying for you, sis!