Paraguard & Pregnancy

Makenna
I'm 15 and I have had the Paraguard iud for like 3-4 months. I just lost my virginity yesterday to a super sweet guy that really cares for me. Anyways, I let him finish inside of me twice. Can someone tell me the chances of me getting pregnant and when and how to use a pregnancy test? I would ask my parents I just don't want to start any drama up at this point in time since my moms got a lot of stress on her already. Please help me out! It would mean a lot. :)