I'm sorry if this is a stupid question and I'm grasping at straws

But we've been trying for SO long now.

Ovulation was on 1st Jan. I experienced one drop of light blood late mid last week. I thought that might have been implantation.

AF was supposed to start on Tuesday. Nothing yet.

I know Clomid and PMS symptoms can be similar to pregnancy so I'm not even going to list those. And I know Clomid can cause you to be late too.

Sorry for TMI but Hubby and I had sex this morning and along with his semen was brown discharge. Could that be old ridisual implantation blood at all?

My periods do start off with a bit of brown spotting so I don't know if I should consider myself out, or if what I saw this morning was old IB.

I have taken tests, yesterday and today. They are negative.

Am I being stupid to be hopeful?