I’m on nexplanon ...

So I’ve been on the implant for about 3 months. I had 4 periods so far. Well since Nov. started I had no period. My boyfriend came in me but Idk is it possible to be pregnant ?? I have no symptoms.. and 2nd isn’t this implant effective.. I can feel the implant in my arm it’s not bend ... it’s not in the wrong place so jus wondering