bearie, think brown discharge is normal too... so long as not fresh red blood... acute pain so long as not persistent and lasted only for a short while is also normal... 4 weeks from last menses means the earliest is 2 weeks of conceived (but u need to take account into the fact u might conceived late.. for my case, i conceived late coz i ovulated late). So ur sac is probably just starting to grow... too early to worry... to be safe hor, wear a panty liner or light colored panty so u can monitor for any spotting.. otherwise, just wait.... i also very kan cheong de... b4 i see baby heartbeat, if i wake up without any MS, i will faster take the pregnancy kit go test... to reassure myself.. hahaaa...