This is my 3rd IVF CYCLE. Be successful?

This is my 3rd IVF CYCLE after 2 failed attempts And prior to that I had one Misscarriage in 2018 I was very hopeful that after all these attempts this might be it !! But after embryo transfer on 15th July it is 9th day today and I have already started experiencing all the symptoms of getting periods does this mean that the implantation has failed ??? As I was not getting any symptoms of periods before today?? I need to know if there is any way to find out that why does the Implantation must have failed??? Inspite of having Good embryos as per the Doctor? As I have now left with only one attempt left at my disposal and we can't afford to go ahead as I personally am stressed mentally and physically with this whole failure thing happening again and again Or is there any way to make sure that the Implantation will be successful?? I really need suggestions on this