Testing too early?

Amanda

So according to opk I took I should have ovulated the 19th. So I am now 9 DPO. I took a pregnancy test today and it was negative. I don't want to keep my hopes alive for a few more days but my doctor told me to wait til the 30th to take one then call her (I'm on my first round of Femara). So I'm going to take another one then. But is it possible it's too early? Has anyone gotten a BFN at 9 DPO then a positive a few days later?? Help!