Pregnancy test?

So I'm on birth control, the Nuva ring. And I haven't taken it out yet to have my period but I also start to show signs of my period before I take it out any way. Lately my boyfriend has been finishin inside me, which I have been okay with. But I'm starting to worry that I may be pregnant. I should be starting my period any day now and have yet to show any signs for it. I'm wondering if I were to leave my bc in and take a pregnancy test if it would interfere with the accuracy of the pregnancy test?