Missed Period

So I’m 18 and just started birth control December 24th along with my period. After my period finished I had breakthrough bleeding until June 1st my period ended the 29th of December. My boyfriend and I then had sex the 2nd of June, he did not nut in me. I then started having breakthrough bleeding up until the 20th, when I finally finished I was relieved. I was supposed to start my period 24th of June and have not. I have taken 4 pregnancy 2 before my period was supposed to start and 2 more after I did not get it. What is going on? I am new to birth control and am very scared