9 days ago I had my egg transferred back from only having a 2 day transfer not a 3 or 5 day. I tested negative after 9 days. Too early to be testing?

Yes. It is too early to test. It takes an embryo about two weeks to make enough HCG for a positive pregnancy test. Please re do the test in 4-5 days. Use first morning urine and follow the instructions for the test carefully. A blood test may be positive sooner.