Pregnant!

So basically I have had a period since I last had sex, but recently I’ve become really tired, had diarrhoea and feeling a bit sick, also cold all the time. I’m thinking has his cum somehow got into my vagina or maybe when he was fingering me? Or am I just ill idk, I have my period in 5 days, should I take a test?

Someone helpp!! I feel so lonely I’m only 16