Hay, that's something you really need to check with your OB right away, sis, kahit walang pain, any unusual discharge or spotting during pregnancy shouldn't be ignored, especially at 12 weeks pa lang kayo. A few of us moms had similar worries and it turned out to be different things, some hormonal, some needed attention, pero ang point is, better safe than sorry talaga when you're pregnant, kaya go na sa doctor para ma-check properly at ma-ease ang mind mo!