Could pre ejaculate get you pregnant if you had sex before your period started? My period was only 2 days but very heavy and bright red blood

Preejaculate & sperm. Presence of sperm in pre-ejaculate is rare. If you are concern about pregnancy due to not having used any contraceptives, recommend getting tested.
Pre=still ejaculatio. Pre ejacuatiion is still ejaculation and could result in pregnancy. Condoms are still better than pulling it out "just in time".
Ovulation. No. You are not pregnant. You get pregnant from sex the five days before ovulation. Not before menstruation. Bleeding at your period, even if less than normal, never represents pregnancy.