TTC how are my chances?

Do I have a pretty good chance for multiple sessions before ovulation time? My SO and I plan on doing the BD on the 12th & 13th when I supposedly ovulate.
I am so nauseous! And cramps. Woke up 2 days in a row wanting to throw up!
I've heard sperm can be alive up to 7 days inside.
We have used preseed as well!