Had embryo transfer on 30/08/14. my urine pregnancy test negative today. how are the chances of me being pregnant ?

Still early: It is difficult to say until you go pass 16 days post-egg retrieval, at which time a urine pregnancy test may tell you if you are pregnant or not (if your period did not start). By waiting a few days it will sort itself out.

Embryo transfer: It may still be early for the embryo to implant and raise HCG level enough for a positive urine pregnancy test. Give it at least a month, if the test is still negative then repeat it in the blood and follow up with your fertility specialist