I have been having sex for a while now, but my bf of 5months & I have been having unprotected sex with no birth control. My last period started on the 14th January & finished on the 21st. im not sure on my cycle. but we've had sex everyday for like the last week i guess, & today i have found blood on my underwear just wondering if i might be pregnant or what is happening? is it possible to know if my period isnt due for another week or two?

Please help me.