I asked my OB about this, and also about monitoring the baby movements (as not at 25weeks bubs is pretty active) but he told me not to stress about it too much. He said if I couldn't find the heartbeat that would cause me more stress than it was worth, and that was more harmful to bubs. He was the same with the movement told me unless I was feeling nothing at all, not to worry about where, when, how often etc. Until much later in the Pregnancy, just to enjoy it. Heartbeats are good, but movement is better I think, and in my OB's opinion being as relaxed as possible (yeah i know easier said than done) is the best for bubs.

Personally I decided against getting one, because I'm prone to worry about things alot, and if I had one I think while at first it would decrease my stress, ultimately it would give me something else to worry about. Does that make sense?

I can understand after what you have been through wanting the reassurance. I hope everything goes well for you.