Boyfriend came inside me for the first time

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So my boyfriend came inside me for the first time two days ago. I have a birth control implant. Nexplanon. I got the implant on November 27. Just this past month. He is super freaked out about me being knocked up and wants me to take PlanB. But I keep telling him that my implant is one of the most effective birth controls. I got it so he could cum inside me and to put my mind at rest about taking a pill every damn day. He is just super wigged out and now it’s freaking me out. So please ladies give me ur advice bc he won’t leave me alone!