9 days late with my period, no bleeding, shoulder tip pain, some stomach pain, diarrhea, lower back neck pain but three negative pregnancy tests. should i be seen?

Women can occasionally skip a period, especially if they don't release an egg that cycle. The late cycle can eventually comes down with greater flow. This is likely just a delay. If the symptoms were related to pregnancy they would be triggered by the hormones that turn a test positive. If you would go in for the symptoms without the delay then go, if not I'd give it some time.