I've taken it. I am one of those women who gets nauseous very easily and it did NOT make me nauseous nor upset my stomach.
We were having sex one night and he thought he was in the backdoor, and he was actually in my vagina. I thought he knew, and he came. I told him that night and he was panicked (we have kids, one out of college, one in college and one who is still a child, My Man is in his 50s, we are too far along to be parents again)
I told him the next morning I was going to get Plan B. I called Walgreens first (in my state they have to sell it to you, or they lose their license) I went, made sure I had my ID (you have to be 18 to buy it in our state, I look MUCH older than 18, but the guy carded me anyway) and I went home and took it.
I got my period on schedule, no problem, no issue no fuss.
If you have a sex accident, and are not ready for a child or a pregnancy, it is the responsible thing to get Plan B and take it. The sooner you take it after the event the better it works, but you can take it up to 72 hours after the event.
Call you BF, have him make up a freaking excuse to get out of work and have HIM take you to the pharmacy to get it
. (Don't give me a "yeah, but" just DO IT!) It's HIS responsibility, too. MAKE SURE they have it first, if they don't call an other one and an other one until someone has it. Or take a taxicab. OR call a pharmacy that might deliver it.
It's the responsible thing to do.