this is my first full cycle bbt and charting. i found FF late last cycle when we started to seriously ttc and happened to start on my ovulation time
so far its nerve wracking because im flailing at where my LH surges are and such lol. but thats because im impatient.
How long do your periods last? Mine last 8-10 days (usually 10) and two apps have me starting to be fertile the last two days of my period. I definitely don't want to do the baby dance while I'm still on my period
My periods are 3-4 days, with an odd day at 5 sometimes.
If you just started to input your info, dont take the apps to heart yet. Takes at LEAST 3 cycles for it to properly anaylize your cycles. And no, you wouldnt be fertile on your period, lol. So that should tell you its wrong.
Pay attention to your cm. Read up on it and usually thats the best indicator that you are getting ready to O. I use 3 different apps, but more for the community - FF is the only one I use with my symptoms and such.