I went out with friends for a birthday celebration, got home late and didn't take my birth control pill (Day 6 of week 2). Woke up the next morning and took it but threw up shortly after. I did not replace it with another pill. I took my regular pill later than night and continued with my pill for the remainder of the pack. I regularly have unprotected sex with my husband. I got a lighter than normal period on week 4. I am supposed to get my period again soon and usually have signs of it coming by now and I do not. What are the chances I am pregnant??