I just got on the implant a little over a week ago. They inserted it on my third day of my cycle… today I had sex and he came in me, now I’m bleeding.. the doctor said if inserted while on certain days of your cycle, you are protected immediately. Is this true?

Yes, if the implant is inserted within 5 days of the first day of your menstrual cycle, you are immediately protected from getting pregnant.  Of course, it doesn’t protect you against sexually transmitted infections, so a condom is still recommended.