Hi, i'm sorry to here you had slightly low fertization, it's not all bleak though, honestly.
'average' fertilization is around 60-70%, so at 50% you were only just under. Bear in mind that not all 6 eggs were necessarily mature and capable of fertilzation too.
The 3 you have now, have every chance of continuing to divide and being capable of making good quality embryos that can make a baby, try to focus on that.
I hate that phrase, it only takes 1, so I won't say that, but in reality you can only have 1 or 2 transferred anyway and very few embryos are capable of being frozen, so you just don't need lots.
My amh is the same as yours, for my first IVF we had only 5 or 6 follicles visible, then somehow we had 24 eggs retrieved. I felt such a relief. Then, despite no male factor issues, we only had 2 fertilize. I was devastated so I know how it feels. My two didn;t make it that cycle, but I googled waaaay too much at the time and I can tell you there are plenty of good news stories in similar situation......IVF is a survival of the fittest embryos and right now you have 3 embryos that are surviving