I saw something on tv that a new pg test could be used six days before AF is due. Did I get this right? Does anyone know which test this is and it it's reliable? If not, which are the most relaible tests?
If you read the packet for the FR test it actually boils down to 4 days before your period is due - i.e. 10dpo. The label is misleading in the extreme IMO.
These tests are "reliable" in that they pick up a small amount of HCG. However, it is very common for eggs to fail to implant properly and so you might be better off waiting until you are late rather than having a BFP at 10dpo and then getting your period, which is a complete rollercoaster when it happens.
If you read the instructions they give the example that if you are due on a particular day - day 21 iirc - you can test from day 17.
I'm not sure how they make that 6 days. I suppose counting inclusively it might be 5 days. I suppose if you add another day for the day your period is due and test the first day after your period was due that would make 6.
It is very misleading IMO. Most women, when seeing an HPT saying they can test 4 days early would, with a 14 day luteal phase, consider that to be 10dpo. FR would consider that to be "6 days before your missed period" or whatever wording it is that they use.