Cramping and spotting

Shannon
Hey girls.  I know I am a horrible worry wart but I just NEED opinions.  
This is my first pregnancy and I am about 6 weeks pregnant and don't go to my doctor until next Wednesday.
I've had very minor cramps here and there basically the entire time.  Last night, I woke up around 1am to go pee, and when I laid back down had a pretty painful cramp.  It wasn't so bad I was curled up in a ball or anything, just a little more painful then usual.  I had a hard time differentiating if it was gas or not.  I have had spells of constipation.
Then later today, I went to the bathroom.  When I wiped there was a tiny little bit of like brown spotting.  But almost not noticeable or even enough to actually call it spotting.  There was a period sized (.) dot of red.  It was the same the next time I went to the bathroom but even less!!!
This was about 2 hours ago, and nothing since.
Should I be worried?! Or am I just overthinking this and should be fine!?  Help!!