HCG levels...

I've had blood drawn 2 times now. Like 4 days apart from another the first time was 531. & Today they called & said it was in the 2,000. But said its still too early to see anything in an ultrasound, so no one knows how far along I really am... Ovulated late apparently. So Im not technically 6w5d according to LMP. So any ideas on what I might be then??