They used ICSI on 15 eggs. When they called yesterday 10had fertilised for sure but 5 of them hadn't progressed as fast, at the time of speaking to us they didn't want to 100% rule them out invade they were slow developers. As for freezing them on different days, I have no idea really for their reasoning. That's a question I'll have to ask at my follow up. Now I have to get my body healthy as I have mild/moderate OHSS. It's hard for me to drink 2-3 litres a day as I barely drink. DP is walking around like he's on ice skates, I think he's doing better than I expected. It's amazing, you can barely see the incision, it just looks like a small divot.