Could I be pregnant?

Okay so 2 weeks ago tomorrow me and my boyfriend were having sex and the condom split without us realising. The morning after I took plan B which made my period a week late. ( my period was due a few days after taking plan B).
I was really happy to get my period, but I was only on for 3 days.
I'm worrying like crazy as I'm scared it could have been implantation bleeding. 
I'm only 16 and my parents would be so mad at me, and I don't know what to do.
Should I take a pregnancy test or go and see my doctor!
Please help me!
Thanks girlies😌