How early will your period end if you had s*x and got pregnant while durring your cycle?

Question

if you have unprotected s*x durring your period, how early would it stop? within hours? or days?

Answer 1

You cant get pregnant on your period

Answer 2

That period wouldn't end any earlier.  You would miss your next one.  

Although it is true that you can get pregnant at point in your cycle, it is much less likely to occur during your period.  Typically (and this is the real issue - typically but not always), you ovulate at around cycle day #14 (the first day of your period is cycle day #1).  There needs to be an egg (and a sperm) present in order to get pregnant.  

So, assume that your ovulation date isn't fixed in stone and you could ovulate between days 11-17 (+/- 3days).  Figure that men's sperm can live up to ~48 hours inside of you.  This expands the 'fertile' time to days 9-19 maybe.  The first few days of your period and the last couple of days right before it, you are much less likely to get pregnant.  NOTE that I said LESS likely.  It is still certainly possible...

Again, if you started your cycle and somehow got pregnant during it, that period wouldn't end early, you'd just miss your next one.  

good luck!