Sayang, lepas je contact your doctor or pergi klinik/hospital sekarang jugak, okay? Spotting dalam early pregnancy tu boleh jadi apa-apa reasons, tapi at 4 weeks this is something they need to check proper-proper. Better safe than sorry, a few of my mum friends had spotting and their doctors just wanted to see them untuk confirm everything okay je. Don't stress yourself lah, just get checked. If boleh go today, go la, or at least call the clinic and ask if you should come in. Take care, okay?