*UPDATE* so I have gotten another pregnancy test just to try put my mind at ease. Just took it and got "not pregnant".

Ok so I had unprotected sex a few days after my period (day 9 of my cycle). He pulled out and came on me (sorry tmi). I took plan b hours afterward to be safe and experienced spotting about 2 weeks later during my fertility window. My cycle have been pretty regular at 35 days but now my period is 2 days late but I have been experiencing mild cramping (normal before my period). I'm also extremely moody and super hungry (not really normal for me). I took a pregnancy test at around day 25-27 and came back negative. I also haven't been getting the best sleep or eating well and will admit to being stressed for a small portion of this cycle. Should I take another test? What are my chances that I could be pregnant? Or is this all in my head?