How to tell my bf

We were trying to get pregnant for almost 2 years and I decided to start on birth control because of the timing, he was upset but agreed. I was waiting for aunt flow so I could start taking the pill and she never came. I'm 9 days late and I took 2 pregnancy tests, they both were a strong positive. I'm nervous to tell him and idk why. I haven't told anyone yet either. I'm needing some support or advice please..