Waiting to hear from doc

Had what I hoped was a normal period this month, got my hopes up that this cycle might be the one, and then bam... 2 days after AF left, I started bleeding again. Mostly light and brown, but then Sunday night it was bright red. It stopped again but I am so frustrated. My doc was out of the office yesterday so I'm waiting to hear what she says... I'm so afraid she's going to say "just keep trying and don't worry about it yet." If something is wrong, why should we have to try so long before we find out???