Over a week late, lost virginity..

I started dating my boyfriend a month ago. We started having unprotected sex pretty early in our relationship. Neither of us like the way it feels with a condom. This was also when I lost my virginity. 
Since we started dating I have had one period. March 20-24th. 
 
I am now over a week late on my period. I've been worried about being pregnant since the day we started having sex. He swears that he didn't come in me at all, but we've had a few close calls. 
Can I get pregnant from precome? Can losing my virginity cause my period to be irregular? What is hysteria and can that be considered a real factor here? 
I'm really freaking out here and he's stressed as well. We aren't ready to be parents. I'm taking some tests today, hopefully I get good news. 

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