my period is very illregular is something wrong

I'm virgin and I'm 15 years old and my period is late about a week . My boyfriend fingered me after I gave him a ha****b and when he cum he had little bit in his hands .can I get pregnant from this? I'm so worried because when I was waiting for my period I went to pee and when I whiped my vagina I had little bit of blood and I thought that my period will come but it didnt. please someone tell me if I have to worry