Are me (15F ) and my bf (15M) using contraceptives properly?

My bf (15m) and I (15f) have been dating for about a year and a half. We have a lovely relationship, and recently started having sex. I’d say we started in December. We use condoms every time, and we still withdrawal with the condom on. I also track my cycle so that we don’t do stuff while I’m fertile. Is this enough?

We love each other and this part of our relationship very much. However, we are both top of our class and seriously can’t afford any accidents. The only birth control I’d be fond of is the copper IUD, but I’m young and I’d need parental consent. Does anyone have any advice?