S.L.
I would go back to your OB to have another test ran just in case. My last period was June 20th, and I was due to start my next on July 28th, but never did. 3 weeks and 3 negative tests later, I had a positive test yesterday! I'd get checked out again by your doc. My first pregnancy was a surprise and I actually had my annual the same week I conceived and my dr office didnt detect it.