Nausea and slight cramps for 8 days now, sore breasts for about two days. ejaculated inside of during ovulation. could this be early pregnancy?

Possible: Any time semen enters the vagina, especially around your ovulation time, you are at risk of getting pregnant. You can try a pregnancy test, or wait to see if your period comes. If it is late, than check a pregnancy test 1 week after, and if positive, congratulations and best wishes. If you want to get pregnant, start prenatal vitamins too and see gyn.