I'm a big fan of Fertility Friend and signed up (and paid) for charting purposes...

Fortunately, after a few months, I got my first BFP and FF changed over to be a pregnancy tracker...

To be honest, it's great...but I wouldn't pay for it just as a pregnancy tracker...you can get a lot of the information regarding your baby's growth from websites for free...

But...up to you! I have it...but only because I had already paid for it...