Where's my period

Ashleigh
Okay ladies. I have not had my period for 2 months. My period is always on time within 2 days. I have had no pain or anything. I bled like 1 drop of blood one day then again like 4 days later. I have been nauseous. I am not under stress and not exercising strenuously. But I have also had 5 negative urine pregnancy tests. I have talked with a couple nurses I work with and have no clue what it could be. I go to the doctor on the 5th but just wondering if anyone else has gone through this and found out what it could be. (PS...I don't have any std's. I have been checked.)