my last period was on 21 dec and ended on 24 dec and I conceived on 4th of Jan... so you probably conceived couple of days before me for 28-30 days period.
wow.. you're the same as me.. its probably between the 3-6th of Jan...
depends on how long your cycles are, on a normal 28 day cycle you would normaly ovulate around day 14. you can go to mymonthlycycles.com and go to the Ovulation Calculator and put in your last period and how many days your cycles last and it should tell you about when you should have ov.