So I need some advice..

So my projected period start date was 08/12, my periods are extremely regular but I hadn’t been experiencing any of the symptoms I usually do when I am about to start my period. I usually get intense cramping and diarrhea and very moody, but none of these things happened. Instead I put a tampon in on the 12th as a caution Incase my period was going to start and only had the smallest amount of light brown discharge mixed with white cm, so I immediately took out the tampon and didn’t wear anything at all. Nothing was visible in my underwear and I would only have light brown discharge and white cm for 3-4 days after the 12th. I took two pregnancy tests one on the 20th at night when I had bought them and another in the morning both were negative so I brushed it off thinking I would maybe start later in the week. I am now 20 days late and have had really bad nausea lately in the morning right after eating, I still have white cm when I wipe and took another pregnancy test on the 26th and there looked like there was a vvfl, but I wasn’t positive. Should I retest tomorrow morning or wait until the end of the week to see if the vvfl will be darker ??