I personally wouldn't get too worried about WashU's decisions, since they never really give you a negative decision. They will only reject you if it was readily apparent you wouldn't fit in (which is few from what I was told). Either you get an acceptance, or you are sent back to the applicant pool for the next meeting. You will be in limbo until early April if you are not accepted, when they send out their waitlist letters, which is almost to everybody. There is somewhat of a separation in the waitlist letters, those who are "thrivers" (who are predominantly accepted off the waitlist, at least from the polling from here at SDN... but it seems many candidates get this letter), or non-thrivers.
So I wouldn't worry yet, its a long way until April and waitlist movement in May. They'll call you for good news, but they never really tell you they aren't interested in you (outside of the hint that they didn't offer you an acceptance after their meetings). It kind of sucked not knowing where you stood, beyond the waitlist "hint" they gave me in April.