I'm not TTC, but was downloading some free parenting apps just now & they have the My Fertility Charts app on there free. I used both that & FF to get BFP#1, but the cool thing with that app is it will adjust the temps if you get up late or miss one.
TTC January 2010
BFP #1 10-11-10 ectopic discovered 10-22-10,
10-23-10 methotrexate & emergency surgery, lost right tube BFP #2
12-1-10 Found to be tissue dropped from salingectomy or missed heterotopic
pregnancy from BFP #1 BFP #3 1-30-11 DS arrived on due date 10-10-11 BFP
#4 Surprise 9-3-12 EDD 5-9-13 DS2 arrived 5-5-13 BFP #5 5-14-14 Emergency D&C 6-16-14 9 weeks