I had unprotected sex last sunday and took next choice that following monday morning. i made a big mistake again and had unprotected sex again tonight?

Use again: Use over the counter Plan B or Next Choice if intercourse was within 72 hours to decrease the risk of unplanned pregnancy. You really need to begin using condoms or start a more reliable form of birth control. Emergency contraception will not always work. Consider an iud and then you don't even have to think about birth control and these stressful scares will be eliminated.