Period late

Im 7 days late on my period, after My last period days me and my boyfriend had unprotected sex. And after that i havent gotten my period, i dont know if its normal to be 7 days late or not. I dont know if i should get tested or wait. On dec 31 we had unprotected sex again, because he thinks im pregnant.. but i dont know .. should i just wait another week or get tested now.  I use to be on birth control at the begging of 2015 only took 2 shoots i dont know if that is still on my system and preventing me to get pregnant. I dont know, if it still in work or not.  Help please