<s>[INST] age: 38, had etopic pregnancy in 2011, did 3 cycles of IUI but not succeeded. IVF: first cycle with embro transfer done 10 days ago(on 21 Feb 2014) this morning 3am felt sudden cold(so cold that I could not stop shivering which lasted around 5-10mins). After the cold subsided, felt severe cramps at lower admen for about 3mins. after the cramps subsided, I still feel cold and shivered sightly throughout the night. Also, I sweat a lot. I have been having the cold shivers with sweat two days before every menstrual period comes since last year(also during the time I did the IUI). Before I started the IVF procedure, I have told my doctor but he did not show much concern that it will affect the IVF. [/INST] Your symptoms are very non-specific, meaning they can be a attributed to a a number of things or it could be completely benign. The fact that you are having these symptoms (shivering and sweating) close to your menstrual cycle could mean that it is simply related to your period. Before every period, some women experience different symptoms, and the shivering/sweating may just be the symptoms you experience before your period. The fact that your symptoms were much worse with IVF may just be a reflection of the increased hormones incurred throughout IVF. Be positive, and take a pregnancy test ASAP. Good luck! </s>