Woke up with really bad cramping?

Brittany • Baby boy was born April 21, 2015 at 21:49 weighing 6 lb 10 oz and 19 inches long!(:
I usually start getting AF symptoms about 2-3 days before it comes, but the last few days I've been cramping, very fatigued, sensitive nipples, nauseous. Took a test today because I couldn't wait and it was a BFN. Hopefully it was just too early, what do you guys think?