Could it be pregnancy? Answers quick!!!

Asking for my sister...I'm 25 wks pg! Took one time,her and her husband have been trying for over 2 yrs and it just don't happen. But for the last 4-5 days she's been sick-ish. Can't keep food down (as I'm diarrhea) and nauseous and kinda light headed and peeing more than normal! Could this be early pg symptoms?? This sister is trying to be optimistic about it!!!🤞🏼🤞🏼