Smelling onions all day

Its been 7 days since me and my husband had sex and it was 2 days before my fertile window. Idk yet if I'm pregnant but all day I've been smelling onions. I don't Cook with onions BC my husband hates onions yet all day long I have smelled it and its giving me a headache and making me nauseous. Im wondering if that would be an early pregnancy symptoms?