Answer: Hi, It's impossible to say without doing a pregnancy test. Perhaps you were within your fertile window when you had sex but this depends on the length of your cycle. Not every women has a regular 28 day menstrual cycle which means their fertile "window" is around day 14. I suggest you do a pregnancy test if you're unsure. You could buy one over the counter or go to your GP who can organise a pregnancy test to be done. Check the Huggies website for more comprehensive information about contraception and conception. Cheers Jane