Chemical pregnancy and no bleeding?

Has anyone ever had a cp but not bleed afterwards? I got a faint positive hpt on January 17th, a few days later it was more faint, then all negatives. I never did bleed and I missed my period that month (due Jan 24th) now Feb. 12 (currently 19 days late!) and still no bleeding or period. I took my last pregnancy test last week and it was negative. I have sore breasts and af like cramps but not sure why I haven't bled at all yet. Af is due again tomorrow so I'm trying to see if she shows. if not I will call my Dr. but just thought I would have bled by now. Anyone have any thoughts on why I haven't bled yet or what could be going on? Thank you for any insight.