I'll tell you one story of hearing God's voice.
I had just experienced my second miscarriage after years of trying to have another child. We had gone to fertility doctors, I had some surgeries, many shots and now I had lost another much wanted child. So I cried out to God. I was ready to accept that I'd not have any more kids but I really wanted more and if we WERE going to have more, I'd look forward to them. I just prayed, "God, are we going to have more babies??" I absolutely heard him (not by my ears but by my heart) telling me that yes, I would have more babies but they would come to HIS glory and not the doctors. I spoke to my husband the next day and he said he had heard similarly in his prayer time. So we called the fertility doctor and said that we won't be coming in any more. I went to my OB for my checkup after the D&C and we told him what we were going to do. I wanted to get back on the diabetic medication that helped with the issues that I had from polycystic ovarian syndrome but that we would not take any more fertility drugs. He was all for it.
Then we went for prayer at church. We've had many couples prayed over for infertility and most of them have gone on to have children (one didn't but adopted). Interestingly enough, all of the first babies these couples had were boys.
I became pregnant with my son 5 months later.
When he was 18 months old, I thought I had an illness. Nope, it was his little sister.
God clearly told us we'd have another child but to HIS glory. He absolutely got the glory on this one because I knew every mechanical thing of getting pregnant down to the exact day I ovulate. My husband was away when I ovulated and was away long enough around it that I should not have been pregnant.
But God is great - and He worked it out. LOL Not only that, He gave us our bonus baby!!!! Our miracles are now 10 and 12 years old. These were two pregnancies that I had with no fertility drugs. It was only with fertility drugs that I would ovulate. God is good.
And there is no question He spoke to us.