Uh... you could try... but it'd be a pricey experiment if you used them for more than a day or 2 before preg test... and unless you were BFP bound you wouldn't even be able to answer that question at the end of the experiment. That is why I like the cheapies, the only digi I have ever used was a preg digi. I honestly don't know though. If I had to hazard a guess I'd probably say that you probably wouldn't even get a flashing smiley until about when you'd get a faint BFP, because they are made to not jump the gun based on small fluctuations and that is what you are watching for with the OPKs.. watching to see if it gets darker each day (make sure not to compare a wet test to a dry one!!). Perhaps if you are able to take the digi apart and look at the test strip inside? But I honestly don't know :shrug: I'd be interested to know if you happen to try it out and are preggo though!!

