Could I be pregnant?

So here's my story: I was on Depo for 4.5 years (way too long), came off of it 2 years ago last month. DH and I decided to not use protection, because of the lost fertility b/c of the Depo. Finally after 2 years, found out that my fertility has returned (using ClearBlue Easy Fertility Monitor) as of May 2008. Got the little ovulation symbol on the 12/13 of May and 10/11/12ish of June. My period was 1 week early in May and hasn't come in June, and is currently 1 week late. HPTs have been negative. Not any unusual stressors in my life, nothing that should cause my period to be late. Since coming off the depo (within a year of coming off), my cycle has been 35 days clockwork. Delaying going to Dr until the insurance from new job kicks in. Could I still be pregnant? Seems like my are a bit bigger and I've had to pee more...but why would HPTs come up negative?