It is scary, and frustrating. Everyone is different. Some people like lilylove, drsquid and sarahincanada respond well to the stimulation drugs, have a fairly large number if eggs retrieved, good fertilization results, and good egg and sperm quality, which leads to a high proportion of blasts for transfer, so they end up extra embryos to freeze. Others are not so lucky. Out of 12 eggs retrieved, I only had three blasts. We had ours screened for chromosomal abnormalities, and one was abnormal, leaving us with 2. Of the two, one did not survive the thawing process so we were only able to transfer one. Thank goodness it worked, because if not, we would have had to started over from scratch. If we want siblings for this baby, we will have to do another cycle (or several). And I've seen others go through this and wind up with very few eggs retrieved, or poor quality, and have only one embryo to transfer. Its hard to know how it will go for you until you try. My only advice is to be an informed patient, do the research, pick a top clinic with high success rates in your age bracket, elect for chromosomal screening if it's available, and be your own advocate. I'd also consider starting on micronized dhea (25 mg three times a day) and coQ10 (600-800 mg daily) immediately to optimize egg quality.