planned parenthood

Idk if I should just go tomorrow to get checked up or take a pregnancy test friday. Iv been feeling really tired & nauseous & having headaches everyday for almost a week but at the same time i don't think im pregnant since i got my period even though it was really weird & iv been on the pill 6 months. Could i feel sick just because something is going around because i hate this because i NEVER get sick 🙄