I had unprotected sex with my boyfriend a couple of weeks ago and I got the rod fitted 3 days later, I was told conception doesn't happen until 4 to 5 days after sex so I was thinking that the implant would stop fertilization. It was only 2 weeks ago but my period was the week before so I can't take a test, I think I'm over reacting, I have many times before. But could I still be pregnant? And how high are the chances? Thanks x

Yes, you can still be pregnant. The rod won't protect against implantation if indeed the sperm fertilized the egg.