Partner is impatient when it comes to BCs

Morgan • I`m 15 and I`ve been in a relationship with my boyfriend for a year. I am bisexual. I am a sophomore in high school.
I recently started birth control and would like to wait two to three months before having sex so my hormones are regulated so I'm even more protected but my partner gave me an attitude when I told him I wanted to wait. What are your thoughts?