Help!!

I have the implant and last night my boyfriend came in me for the first time and i had this burning sensation, it wasn’t only when I went pee. It happened like literally 5 mins after we had sex and it lasted for about 20 mins? It’s the next day and I’m fine now but I’m wondering if anyone else has experienced this. And I’m not pregnant I took a test a week ago

update : he did it again last night and it didn’t burn I guess it was because it was something new lol