Little help?

I missed 3 pills mid pack and had about a 2-3 day withdrawal bleed before starting a new pack on the 18th of Dec. Had unprotected sex with my husband the week I started my new pack. I didn’t realize I was supposed to use back up bc for the next 7 days after missing 3 pills 🙈 I’ve been extremely nauseous the last couple of days as well as very sensitive nipples. Could I have ovulated during the time I missed the pills? And is it possible to already feel nauseated if pregnant? Seems too soon to me. 🤷🏼‍♀️