Scared for my abortion...

I'm only 19, almost 20 and in nursing school. He is 23 and a police officer. We just hit a year and I am devastated. I am on Nexplanon. I don't know how it happened, but I am pregnant.. We have tons of sex, but thought it was okay since Nexplanon is most I possible to get pregnant on. I have been spotting and having such bad cramps I was crying. I took a test this morning and am still freaking out.. He gets off work in 8 minutes. I am thinking of calling him and asking him tro come over so we can talk... He already agreed to pay for the abortion if anything happens. I paid for the birth control, since my insurance didn't cover all of this kind. I am so scared. When he comes over do I just tell him...? Just tell him I'm pregnant? I am so scared... How did you tell your man..?