preganacy & implant

this morning my boyfriend and I had unprotected sex and he finished in me.

i’ve had the implant/rod in for almost 3 months, should i be okay? or should i take plan B? i know the rod is 99% effective, but i’m still a little worried since this is our first time where he has finished inside me.

we have had unprotected sex before, but he would pull out!