How do I know when to test ?

I need some help please. I had my implant (the implanon) removed on the 2nds of January and while there the lady told me that I could potentially conceive right away and that I may not have a period for up to two months after. This is our first time ttc and I really want it and tend to make up the symptoms of pregnacy in mind but for about the last two weeks I have had very sensitive nipples and although I know that's a sign of af I'm just doing a lot of wishful thinking. I did a test on the 25th but it came back negative. Should I just keep waiting for af or test again soon ?