queeziness 5 weeks pregnant

hi all, would love your thoughts. I'm 5 weeks pregnant and have only suffered with sore boobs, few twinges and an achey lower back. this morning tho... I had my breakfast, de caffeinated coffee and a tea cake. After this I done my yoga and as i was doing this I could smell this horrendous smell - I don't know where it came from out of the blue. all of a sudden this wave of queeziness came over me - but not like I needed to be sick. im afraid im over thinking it because i know im pregnant lol. my question is.. is this how the sickness feeling starts?