Hello. I had laparascopy on 3 December 2007 to check for endometriosis. I had my period on 2 December 2007. I have a 34 day menstrual cycle due to some hormonal disorder since October 2007. On 20 December I checked my ovulation with the Clearblue ovulation kit and got the signal that I was heading towards my ovulation (which should normally be 24-48 hours after the signal). I don't know if I did ovulate but realized that my periods are still not there. I have also had a pregnancy test which is negative. Can the surgery (laparascopy affect my menstrual cycle? What can I do to bring back my period?

Thank you.