Thoughts? What's the chances?

I was in my fertile window between March 12th-19th. I did not track bbt or CM I was just going off what this app was telling me of when my fertile window was. We BD multiple times that week, I am due for AF on April 1st. I've been crampy, but my boobs do NOT hurt as they usually do when I'm about to get my period. So the only symptom I have is cramps. Today and the last couple days I have noticed this in my underwear. It's got a lotion type feel, I never have this type of CM before my period. Is this a sign of pregnancy? I keep waiting for "implantation bleeding" but it hasn't happened. Just wondering what everyone thinks. I will test once I miss my period.