You weren't given the right information . Most sperm lives up to 3 days , so having sex on the 7-10th of January could have gotten you pregnant. Take a test
so ur saying i couldnt of gotten pregnant having sex on those days?
um no sperm stays in body for 5 days im a pro at this topic bc i calculated and researched my ovulation and periods for months to get prego fr instance i ovulated around the 31st i am now 7w2d and estimated conception date was the 30th i was told ur pose to have sex b4 during and after ovulation in case its late or early keep hips elevated afterwards for sperm to flow heard takin prenatal vitamins helps to get prego havin sex more then once a day around ovulation helps and dont have sex for a few days to a wk b4 ovulation that way when u do he explodes lol just be patient it took me 7 months twice to get prego let me kno if u have ne other questions! hope this helped good luck