Hi there if your on a regular 28 day cycle the best thing you could do is wait for your period and if it does miss, then probly take an hpt around the 3rd or 4th week of december.


They say that you are safe (not with the stds tho) even if you have unprotected sex by 5 days befor or 5 days after your period however its really hard to tell as there are some women who could easily conceive and some that would even take months or years to conceive.


Just try not to stress to much because sometimes stress could also suppress your period.


Good luck!