Spotting...

I had some light brown spotting last night, but not this morning when I woke up. To say I'm freaking out is an understatement. I'm calling the dr. first thing this morning...just hope I can get a hold of someone.
Any preggers or IVF'rs out there have any experience with this. I'm 24 DPO. My heart feels like it's 400 pounds right now! So scared! My eyes look like they're glued shut from crying myself to sleep last night while D held me tight! Love you all!!