Sex for the first time and soo many questions

Hi guys!
So my boyfriend and I had sex (for the first time ever, with anyone!) about 6 days ago. It was the day after I supposedly stopped menstruating, but after we had sex, I started bleeding again??? Could that have just been my period finishing up, or was it the hymen breaking? 
Also it was unprotected sex and he came inside of me, so with the bleeding in mind, do you think I need to grab a pregnancy test? Or what should I do? 
Your advice would be much appreciated!! XOXO

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