Patch or shot?

I just recently lost my v-card a week ago & he wants to hook up w/ me again on the 4-6 this march. I really don't wanna take a lot of pills or insert a ring but I feel like I need some type of birth control. I want something that I can just do once to cover those 3 days without getting pregnant. Today is the 3rd day of my period and during that week of march I think I will be ovulating so I don't think planb one step would cover me during ovulation. What should I do?