Anak, any unusual discharge in pregnancy, lalo na kung dark brown, kailangan i-check agad ng doctor, okay? Hindi mo dapat maghintay pa kahit wala pang cramps, better safe than sorry talaga. Go to your OB or nearest clinic ngayon na if possible, they'll do an ultrasound to make sure baby is okay. A few of us mums have been through similar scares, and ang hirap ng waiting, pero alam mo naman na doctors lang ang makakasiguro talaga. Keep me posted, and praying for you