I had sex on 1/3 and acccording to my period tracker I was fertile. My cycle was supposed to start on 1/20, but it hasn t as of today. I spotted on 1/16 with the cramps, breast tenderness, all signs of my cycle starting. But here it is 1/21 and nothing. I took a pregnancy test this morning, with the first morning urine, and the test was positive. I am also having issues with sinus drainage, in which I took some Nyquil last night. Two questions: Am I really pregnant? OR can Nyquil alter the reading?