Well, the symptoms you're describing are also symptoms of your period coming. A lot of women experience sore breasts, irritability, cramps and all the rest of it just before their period comes, so don't rule that out! I'd give it the rest of the week. It's only Wednesday which means your period still has time to come this week. If it's not come by the end of the week then take a test. I know you're scared of the results, but you can't just ignore it. It's as simple as that, really. You can continue to ignore this all you want, but if you are pregnant, then ignoring it won't make it go away :P
Give it a few days, hmm? If your period still hasn't come, then your only other option is to take a test or visit the doctor. I don't know if there's a possibility of pregnancy - it sounds like you've had sex with three guys, but I don't know if you're on birth control or if any other form of protection was used. If you've had sex then, yes, pregnancy is possible. So take a test. =]