I have experienced this for myself a few times, without really knowing about LOA. It is only now, after researching & learning about it, that I realised that my having Focused on "something" could possibly have made it happen.
I have always believed in Source Energy, I have written about it here before, I didn't fully understand it myself though until recently when I came across Abraham. The moment I listened to Abraham via Esther Hicks, I felt goosebumps all over my body! These were the answers I had been looking for my whole life. From the moment I listened I began to change, I got my Hope back, my Belief was renewed, and I had a whole new Understanding of Source Energy, Law of Attraction & how it all comes together.
Be careful what you wish for..... You have to be clear & precise about what it is that you want, let go of Negative Energy & live your life with Positive thoughts & actions.
Try these Meditations, I have found them really helpful