Could Two Contraceptive Pills Be Taken On The Same Day?

I usually take my birth control pill everyday at 3:00 pm.On Monday Jan 10 I missed a pill and had unprotected sex about 8:30 pm that night(he didnt ejaculate in me)I didnt realize I missed a pill till about 1:00 am.Can I take this pill along wit my tuesday Jan 11 pill?Do I have to wait till 3 pm to also take this pill?OR Do I have to go get a plan B pill?Is there a big chance I will become pregnant even though this the first time I done missed a pill this month?This is also my second week on this pack of pills.Next month will be 2 years since I been on Birth Control.