I had an u/s done at 6 weeks. i thought i was 7. found out it was twins. found no heartbeat or flicker. is it to soon?

Talk w/ Dr: The Dr who did the u/s is the best to ask about the results - that's part of the procedure! If there was anything drastically wrong - even mildly off - they'd probably have told you. But do call to ask all ?s you have. Yes, it might be a tiny bit soon in your case. Read here: http://americanpregnancy.org/while-pregnant/first-trimester/.