Ok I dont know what to think I need your advice :).?

On June 20th I had My partner has had a vasectomy for 4 years and Im paranoid about pregnancy so I was on Depo Provera and he used a condom before . Being a paranoid person I took a pregnancy test On July 6th it was negative then I took another on July 9th and it too was negative and I took a first response test with first morning urine on July 14th and it was also negative....I cant go by my periods because depo has them all messed up I was bleeding while we had and I bled for 2 weeks straight after pretty heavily....now Im back to my usual spotting on and off all the colors of the rainbow I go back to the doctor tom. because they think I am allergic to the depo shot and they switched me to pills on July 5th. What do you think?