Plan B and period help!!


So, at the end of April I had unprotected sex and took plan b within 12 hours the next day. After the longest week of my life, I ended up getting my period on May 2nd (a week early). I even took two pregnancy tests, both negative. Well this month, AF has not shown up yet and my hormones have been crazy! Nausea in the morning, mood swings etc. To put my mind at ease, I took a pregnancy test last week and it was negative. Can plan B still mess with your hormones after all this time? I did have some spotting around June 2nd for a couple days but no period. My period started on April 10th (two weeks early). Is my body just trying to regulate itself still?