Don't worry at all. I had my first scan at 5 weeks and 3 days and nothing, i had another at 6 weeks and 4 days and the h/b was like 112bpm which they said was normal as it normally only starts from 6-7 weeks (but you could have ovulated a little later and therefore your a couple of days off, i know i was) so dont worry its perfectly normal.
Good luck with your pregaz