What you are describing happened to me about 5 days ago, little pink tinge CM only once, cramping and 2 days later feeling preganant did a test and it was a feint positive (I wasn't breast feeding though) since then lines have been getting darker and cramping continuing intermittently....having said that I had a weird AF before my BFP which was just intermittent spotting, I was sure I was pregnant and waited 5 days before testing but it was a BFN. Hope yours is a positive.