I Had A Mammogram Last Year In Jan Of 2016

I had a mammogram last year in Jan of 2016 and I was called back the next day for a diagnostic mammogram. They found nothing but suggested I come back in July of 2016 for both sides to have a diagnostic and they said it was inconclusive findings. I am having my mammogram in 2 days but it will be a diagnostic mammogram. So basically I am worried and this is my 3rd diagnostic mammogram in a year. Should I be worried?