I had this problem for a little while, but not for the whole time. The regular doctor I'd had scared me VERY much (after already having lost a baby 5 years before that!) but a specialist he sent me to said some women just bleed with a pregnancy and he didn't know why my doctor didn't tell me that. What a relief.

BUT it's not the type of thing to diagnose ourselves whether it's the "normal" kind of bleeding or not, a doctor *always* needs to be seen when it happens.