IME if you go to the GP they will probably tell you that until 6 weeks there's not much they / you can do. If you carry on bleeding and pass more clots I'm afraid you're probably experiencing a mc and I'm really sorry. However if nothing else happens then phone GP or MW, explain situation and they'll probably send you to an Early Pregnancy Unit for an ultrasound. Very probably an internal one ( just so that you're not too shocked!!!)
Bamboo - sorry to hear you're going through this uncertainty.
I found my local Early Pregnancy Unit really helpful (but I was at 10 weeks so easier to scan). You can self refer so if you've not already registered with a MW, you could try giving them a call for advice.