Spring - It is so not fair that you have to go through this. I am positive the spotting or "spot" is just that and nothing else. But I know that it doesn't matter what anyone says, you need medical reassurance. Call your OB, call him now, he wouldn't have given you his number if he didn't want you to call if you need to. Just to put your mind at ease.
Let us know how you go OK. Thinking of you.