Period late by a week

Ok I don’t know what to think. My period varies anywhere from like 25 days to 28 days. A couple of times it didn’t come until 30 or 32 days either because of stress I presume or It didn’t come at all because I was pregnant. I’ve had one time in my life that it came at 34 days. Currently I’m at 35 days and have had two negative tests so far. I don’t even know how it could be possible as my husband was snipped 3 years ago. I’ve been seeing very light pink spotting like 3 times throughout this cycle as well as increased mucus at times. No real symptoms of my period or pregnancy. I do have some cramps on and off but nothing is happening. My dr said it’s normal to miss a period but I’ve never missed one unless I was pregnant. Has anyone else ever heard someone tell them this before?