Planning to have unprotected sex with my boyfriend 4 days after taking the Pill

You will not be protected by the pill after only four days of taking it - birth control pills take two to three weeks to become effective in preventing pregnancy, so it is always advised that you use some backup method like condoms during this time. So no, it definitely is not the good idea. Besides, if you have planned this and are in love, than why can'y you just wait the time it needs for the pill to become effective or just simply use a condom, which is better option anyway. Pregnancy is not the only thing to worry about when you have unprotected sex - there are STDs also.