6 days Late

I'm currently 6 days late for my menstrual cycle according to Glow. My cycle varies. In December I had a 26 day cycle and January a 23 day cycle. I have never gone past 36 days on my cycle before. I took a pregnancy test yesterday and it came back negative. I got a positive pregnancy test 5 days after my missed period with my now 2 year old daughter. I hope I'm pregnant, but I feel like stress may be why my period hasn't came yet. Plus I work nights now which has been an adjustment. I had sex with my husband in hopes that could help stimulate my menstrual cycle, but it did not work. I either want a positive pregnancy test or my period to begin, so my husband and I can try next month.