i chose to go btwn 6-8wk for my first U/S, coz earlier than that maybe only see sac. Today 7.5wk can see heartbeat liao, so more "worth it" dun need to go back 2-3wks later etc.
with #1, everything dunno, wk5 can't see anything, was kept anxious and wondering if i was indeed pregnant.. had to go back again wk7-8 then saw heartbeat.. so could've saved the $$ from the wk5 visit lor.