I follow two period trackers. one says i was fertile 2 days ago and another says i still am fertile, i had unprotected 4 times today, any possibility?

Always a possibility: Regardless of what any method of determining fertility may indicate, it is always possible to become pregnant from unprotected sexual intercourse that i would never recommend unless you want to get pregnant and are certain you and your partner are in a totally monogamous relationship.

Yes: However, if not pregnant this time., for future cycles, he should follow a schedule of abstaining from ejaculation for at least 2 days between times of intercourse.