Missed period but negative urine tests

My boyfriend & I are trying for a baby. We’ve been doing it a lot .. It’s September 6th and my last period was July 5th. But My test all came negative & 4 days ago it showed up as a faded positive. Then today I went to the ER and they said nothing negative was wrong with me & that I’m not pregnant & they would recommend a gynecologist if I keep missing periods. Has anybody went through this??