One of my favorite pregnancy app that I check daily, and towards the end of my pregnancy, multiple times even, is the Baby Bump app (the free one). I love how it provides me a short snippet of tips and advice daily, and a more comprehensive update weekly. I also refer to the groups section quite often for support and topics from other expectant mothers. It's great to know how interactive expectant mothers are, and how willing they are to share their experiences and updates. It's tremendously helpful to me. I love how we can all connect and learn from one another. Check it out!
My second favorite pregnancy app, is Sprouts. I refer to the Sprout app for stunning images and more physiological updates. They have these 3-D like images that makes it soo real.
And towards the end of my 3rd trimester (about 36 weeks), I started experiencing more and more contractions. My favorite app to time my contractions is the Full Term Contraction Timer app. It provides data from your last contraction, last hour, and last 6 hours. It lets you know average duration and frequency, also in graph form. This app helped me organize my contraction history and gives me the ability to email data.
Be sure to check them out!