period ?!

So In May Me and my guy had sex and we didn't use protection so I took plan b and it happened again the week after I know plan b isn't good but that happened it's been 4 months and I haven't had any symptoms of anything honestly I'm really scared to take a pregnancy test but I will . Is it the high dose of the plan b .? Cause again like I said I haven't had any symptoms I haven't gained any weight .