Hello samigget, sorry for late post.
Well, most women get pregnant around the middle of their cycle, but let's not forget that everyone is different and that's why it depends on you and when do your body ovulate. It's not a 100% precisely, for every woman is different. I will try to give you an example. Let's say you start with the middle of month which is 14 days before new menstrual cycle and that period is common to ovulate then. Therefore you have 3 days before 14th and 3 days after to complete the normal cycle of ovulation in case 14th is the exact middle day. No one can know if you release egg in the first day, in the middle day or last day of your normal cycle that is why 11-17 days are most fertile days. However a woman's egg lives for 2 days and a man's sperm for about 5 to 7 days. If you simple calculate then you may know that for example you ovulate 3 days before 14th day but a man's sperm could be already inside from the 7th day and therefore you can get pregnant from that. If your periods cycles aren't normal then all this calculations can vary. However a woman's body can give or take a couple of days both way and that leaves a lot of days open for pregnancy.
All this is making a woman's possibility to get pregnant in ANY day of the month! I hope that I've answered your question and please use birth control pills or/ and condoms to prevent an unwanted pregnancy. Have a nice day and be healthy!