2 bfp yesterday, bfn today :(

Hello ladies, I had been having symptoms for the past 3 days (metallic mouth taste, frequent urination, bloating, very sore breasts, back pain, cloudy urine, creamy discharge). I tested yesterday afternoon twice and got 2 bfp (first response, and a cheap 88¢ test from.Wal-Mart). They were faint but visible and clear. This morning I tested again and it was negative :( I'm not sure what's going on. I went to the doctor and he told me to just wait :/ have any of you ladies have this happen to you? Symptoms are still strong, with no cramps or miscarriage like symptoms....

Any insight would be very helpful.