Personally I could sound like a daft teenager here but after being on Implanon for 12 years I've forgotten all this period and pregnancy lark! 
Anyways, myself and OH are trying to conceive at the ripe old age of 39, I had the implant removed in January and periods have been back regular since about June. After a abnormal biopsy in early November I had a punch biopsy a week later and then on the 24th I had to have a loop diathermy. So on the 22nd and 23rd we indulged ourselves knowing we had 4 weeks without sex to look forward to then 4 weeks with condoms 
Now my optimum ovulation day is around the 27th/28th of the month, and I usually start my period right on the 9th of the month, but its not here and I show no signs of it. I get a headache just before which persists until its over, but nothing! I have done a test, but it was one of those crappy ones from the pound which I'm guessing arent exactly good quality!
I may well have gone off topic though and rambled so my main question is whether anybody has had missed or delayed periods after a loop diathermy, and should I wait until the 9th January before I test even if this one doesnt appear.
We're trying to make it a hat-trick for my parents as my sister is due in February and my brother in May!
Sorry for rambling, one of my worse habits!
Merry Crimbo all! 