So confused!

My fiancé and I have been trying for about a year with no luck. Last Sunday, 6dpo, I spotted kind of pinkish streaky blood and had a lot of extra creamy cm. I thought AF was coming! The next day, very very little pinkish spotting but nothing else! Very heavy boobs, crampy here and there... IT's killing me to wait to test but I'm not due for AF for another 6 days! Any one have any insight? Am I crazy for thinking it might be IB? Help!