Yes it is, still pre-existing, even if it wasnt to your knowledge.
HIPAA is the law.
Best chances for HIPAA to apply are if you go from a group plan to a group plan. Evidentally, individual to group and nothing to group are loop holes, so they can probably get out of it, or make you wait a certain amount of time.
According to a Federal law that I found on the internet, GROUP health insurance cannot consider pregnancy a pre-existing condition if they currently have maternity coverage. However, this law does not apply to INDIVIDUAL health insurance. So, if you've changed jobs, and you now have a GROUP health insurance plan, then there is a good chance that you may be covered.
I just recently got individual insurance through BCBS and I was pregnant and did not know when I requested maternity coverage. BCBS policy says that pregnancy can not be considered a pre-existing condition and their definition of a pre-exisiting condition is a condition that you can been receiving treatment and/or professional advice and help for for 6 months or more before opting for coverage. Also, they say that except for pregnancy all pre-exisiting conditions require a 180 day waiting period.