Oh hun, it's sooooo hard isn't it??

As the others have said, spotting can be very harmless but I totally get why you are worried, I've been there a million times during my 3rd and 4th prg.

Would you consider going to the hospital? That is what I would recommend if you cannot wait until Saturday for a reassurance scan. I'm sure you'll find they will be very accommodating if you explain your history and tell them you are concerned.

Best of luck hun, I've got my fingers crossed for you