This is a Christian romance by Melanie D. Snitker. It is advertised as Love's Compass Book 2; but I had no trouble reading it as a standalone. Lexi Chandler is an ER nurse in Texas when some pain leads her to seek a doctor for herself. What she learns and what follows could test her faith and her budding relationship with Lance, her little brother's best friend, who is quickly becoming her own best friend.
Of course, it's a romance, so no one is tested too far and everything comes out nicely in the end. This was a Kindle book; a nice bit of fluff to read while waiting. I don't usually read this genre - it tends to make me dissatisfied with my life. A steady diet of anything with big, romantic gestures and not enough reality in it: from pornography (not that there's necessarily anything romantic there) to soap operas to romance novels lead a person to expect behavior from their loved ones that just is not humanly possible or sustainable for any length of time. When you expect what you don't get you end up dissatisfied, disappointed, inhumane to all around you.