Possibility of being pregnant??

I'm 16 I had unprotected sex several times almost exactly 2 months ago. But not at all since. I've heard stories that it is possible to be pregnant and still have your monthly period. Not my last period but the period before that my period was irregular maybe a day or two after sex. I have relatively heavy periods but it was just spotting. Then the next month my period was regular? Now I'm waiting for my next. I had what could have been virus for about 5 days I just felt really run down I couldn't stop sleeping my throat was sore I had a headache and cough. I also had a case of what I thought might be food poisoning right when the virus went away, I threw up once and had diarrhea for about 5-6 days but now I'm constipated. During then I had extremely intense stomach pain nausea loss of appetite and headache. All the while I felt extremely bloated and now about 1 1/2 weeks later I still have that bloating but the other symptoms are gone except my appetite unusually small compared to normal. On and off I've had time periods of extreme fatigue very mild cramping but a lot of gurgling and what feels like something spinning in my low low abdomen. I've also had cold symptoms like dry throat, always thirsty, sinus irritation, and a runny nose. I have a feeling I'm pregnant but I've had my period and there could be many other explanations for the other symptoms. I haven't taken a pregnancy test but am going to asap! Does anyone have advice or their own experiences or symptoms to share? Anything will help! I just need reassurance