So my boyfriend had sex around the let week of December or the first week of January. My last period was December 9th to the 15th. All of my periods usually fall on the sixth of each month but I was late last month and it has yet to come this month. I got my wisdom teeth out December 23ed and was under anesthesia and took hydrocodone for a week or so. I've take 5 tests, all negative. Why could my period be so late?? Am I pregnant???