has anyone had this before?

I've been on a regular cycle since July starting on the first. Glow said I was supposed to start today the 5th. Usually my AF comes over night but nothing yet. I have this sharp/dull pain on my right side of my abdomen. Could it be round ligament pain.? Anyone else have this when they were early on with pregnancy. I took a test yesterday it was negative. I will test again  if my AF doesn't come today. The pain seems to be worse when I'm walking. I've been up for about forty minutes and it just started when I was feeding my dogs ten which was ten minutes ago.