help w/ deciding

i had sex with my boyfriend for the first time last weekend and im on birth control (i take it the same time everyday so it should be working lol) and then he pulled out as well for extra safety. of course im kinda nervous about pregnancy but i want to skip my period bc im going to the lake. i shouldnt be that worried if i skip my period and just wait til next month to make sure im not pregant it should be fine right? lol i know i prolly shouldnt be worrying but just want to hear your opinions!