Pregnancy scare... I guess

So a couple weeks ago me and my boyfriend had intercourse and I know I dont supposed to do that at my age but he didn’t use and condom but he kept nutting but he pulled out though .But since then my boobies don’t really hurt I have been feeling a little sick only when I get stuff but don’t throw up . And my period supposed to start on the 20 and that’s today , should I just wait and see what will happen the next day of two ? Or what please help 😭