worried I am having an early MC

Bridget
I got my BFP on Thursday night. The dip tests were crazy faint so we got a CB and it came out positive at 1-2 weeks. 
This morning I started cramping a little bit mostly on my left side. I started spotting then. A little pink at first then small amounts of brown all day. Not enough to leave much on a pantie liner. Def there when I wipe though. 
The lines on the dip tests we a little bit darker today, but not much. I am calling the doc tomorrow. 
Symptoms are: very sore breasts, mild cramping, spotting mostly brown, and fatigue ( that has died down a bit as I lie in bed though
Any guidance would be appreciated.