3 days. Typically, female sperm (x) swim more slowly than male (y). But they live longer. So to increase the probability of a girl, have sex 3 days and maybe 2 days prior to ovulation. The differences in probability is very slight. The other option is sex selection done in a doctor's office. The ejaculate is separated into mostly male and female sperm. The desired portion is then inseminated immediately with success rates close to 98%.
Yes
There are no days of a month where a girl is guranteed to not get pregnant
yes very very likely.
a girl can get pregnant anytime, the whole "this many days before or this many days after my period i cant get pregnant" is a myth, shes just as likely to get pregnant no matter when her period was. you should always use birth control if you are not ready for a baby.
a few days a month.
There are very less chances. Never the less this is possible.
Women are most fertile about 14 days before the start of their period.
no
yes
if your question is "can a girl get pregnant before her first period", then, unless in a very unusual case, no, they cannot.
If menses, means menstrating, then yes a girl can get pregnant.
Getting pregnant is related to ovulation. Because a girl can ovulate before having her first period, it is possible to become pregnant before beginning to menstruate. Any time a girl has sex,she can potentially get pregnant.