Help please

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I am 17 I have been with my boyfriend since I was 15 but didn't have sex until I was 16  we were each others first sexual partners and when we were first together I was on the pill and when he would cum inside it would feel fine but since having the implant it hurts and leaves me in pain for hours after not sure if it's due to the hormones in the implant or what but It just hurts and I don't no why