I had unprotected sex about 48 hours ago, and I have been on birth control for over 10 years and had to switch from other pills that didn't agree with me through the years. I am currently on Tri-sprintec for almost a year now(which is a generic form of birth control). Once in a while I forget to take my pill, by accident. I doubled up for the last few days in a row. So just not sure how effective my birth control is, after doubling up. Should I take the plan b pill, to prevent an unplanned pregnancy? Please need answers asap! Thank you.