I am two days late for my period with negative test. what should i do?

By this point: It should be positive. Check it again but you may not have ovulated properly this month. If your on the pill it's not unusual to miss a period. Good luck, it will likely normalize on its own but go in if your periods become irregular.

Not to worry: May be stress related 2 days plus minus is ok

External influences: Despite what most think of as an automatic and simple system, there is a very complex interaction between several hormones, each of which can be impacted by different life stressors. Infection, trauma, external stress (emotional/social/etc.), diet change or inadequacy, among others, can all impact the reproductive cycle. If irregularity persists, you should see a gyn.