Late Period!!

My last period was May 3rd to May 9th … my next expected period was supposed to start May 31, it’s now June 2nd. My boyfriend and I haven’t been intimate in that sense, but this is the first time in a while where my period hasn’t come on its predicted date. I have taken a couple of pregnancy tests with only morning urine these past few days, all of which have shown negative … my cycle is usually 28 to 30 days. I noticed today some very minor discharge of tiny white specks (refer to picture if you’re comfortable to look) … I’m so much in my head about it. Do you think that the negative pregnancy test results are reliable? I’m an anxious being, so when my period is usually regular and then suddenly MIA, it spikes my anxiety 😩