So my period is currently 3 days late, however I took Plan B about 12 days ago now. The unprotected intercouse was 13 days ago. Anyways, I am 213 pounds and read (after I took it) that the pill is not effective for women at this weight. I have been experiencing cramping in my lower stomach area and also some loose bowel movements (sorry tmi!) I took a pregnant test yesterday and it came back negative. Was wondering when I should try testing again or if plan b is the culprit for making my period late? My husband and I were not planning on having anymore children but are now open to the idea after having this curiosity if we are or not. Any thoughts?