Any help??

It’s been almost four weeks since the last time I had unprotected sex. A week after we did it I got a period for the first time in month since my birth control screwed it all up. It wasn’t effective when we did it. (It was the shot I received back in June) the period was weird. It was mostly light brown blood out of the six days I had it and two days were darkish red blood. The cramps weren’t as intense as they used to be before the shot. I just thought it was weird that I got it exactly six days after we did it (he did finish in me). And for the past week I had cramps and have been very emotional and irritable. Food I used to like have me gagging now and oh my god smells. I can smell something and just want to vomit. I don’t know it’s like pms but it I just had my period a week and a half ago. I know I need to take a test and whatever but that’s kinda hard since I’m young and I’m not comfortable with asking my mom to get me one lol. I will be taking one hopefully Saturday since I’ll see my boyfriend then. I’m just nervous considering I’m so young. But I do have experience but a baby isn’t just no big deal. I could be overreacting I dunno. Just would like some though and opinions.