missed a pill... anxiety rising!

Hello ladies! I have been taking my combination pill for about a year now. I noticed that I accidentally forgot to take my 5th to last pill (before placebos) i have never missed one so I'm panicking of course. I took it when I noticed which was when I had to take the other one. Main question here is... if I'm sexually active (no other protection), and I forgot to take it... what are my chances of being pregnant? I'm like 5 days away from my period but I'm panicking and bloating and all that fun PMS isn't helping my anxiety! PLEASE someone help!