IVF Cycle only one embryo?

[Jen]

So I am doing invitro this cycle. I take birth control until june 1 then start gonal f, doxycycline, cetrotide, hcg trigger prednisone, crinone, p4 oil. My egg retrival is wed june 16. I am 21 and have pcos. Not that bad of pcos and need to lose 15 pounds to be 130 (5'1') My fiance 's sperm is average. The nurse says my lh is higher so she is worried about me overstimulating. She says I will do great but can transfer only one blast!! We wanted twins but she said that can cause to many problems? But what if the one blast doesn't implant. I think I will do ok but I really want to put 2 blasts in. They only do 5 day transfers at this clinc. Please help susscess stories or anything