Hi Emma,
Congrats. I'm just the same as you. Had a m/c at the beginning August and am now 5wks, didn't have a period in between either. If you lost your last baby quite early on, your hormone levels probably fell quite quickly so these are hopefully all new baby hormones which are giving you a positive result. They will probably send you for an early scan so they can date you properly, but that's a good thing anyay as they have kept an eye on me which has been reassuring and you may hopefully get regular scans which i am having. Try not to stress out about this one although it is REALLY hard not too! I have been terrible but i'm trying to remember this is a totally different pregnancy! I'm sure all will be well, congrats and let us know how your scan goes x