I got 2-3 at 4+5, and my beta tests showed I had low, almost but not quite scary low hcg. Baby's fine so far though and has a nice heartbeat. At 4+3, you could easily get 1-2 weeks without worrying, I think.
Izzy, if you got 3+, you're right, either is possible! But it could just be that you have high hcg.