Hey there just go to a GP if you are worried and they should be able to hear babies heart beat from 16wks.. I haven't had a scan since 12 weeks and don't have one til next wed but I have heard babies heart beats (I have twins) twice just at the doctors.. Mind you I am at docs all the time as I am a high risk pregnancy, but if you go and ask to hear heart beat I doubt they would say no.. Good luck.