Hard to give a percentage chance, but if you're asking, "Can I get pregnant the first day I stop bleeding," the answer is, "It depends."
If your cycles are longer than about 26 days, and your period only lasts 4 days, then you're probably not going to get pregnant on day 5. (ovulating on day 12 or later)
If your cycles are 25 days and you bleed for 7? It's more likely that you might get pregnant on day 8. (Ovulating on day 11, give or take.)
Some women are fertile while they are still bleeding. (21 day cycle, 6 day period, ovulation on day 7 or 8... )
How to tell?
1. Figure out how to recognize when you are ovulating.
2. Keep track of your cycles for a month or two, taking your temp every morning before you get out of bed, checking cervical mucus, the works.
3. Note how your cervical mucus changes over the course of the month.
The hardest time to get pregnant is the time from after you ovulate to the time your period starts. With a little practice, it is not too hard to learn when this is, but the consequences of failure during learning are high. Best to use contraception or abstain during your learning time.
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The chances are very insignificant, although theoretically still possible for a minority of women.
As an example, for a 27 days cycle (and 3 days duration), the probability of being in the fertile window on day 4 (i.e. 4 days after the start of your period) is 5%. This does not mean you have a 5% chance of getting pregnant, you have 5% chance to be in the fertile window. As a comparison, on day 11, the probability of being in the fertile window would be 70%.
These probabilities come from a study authored by Colombo, Masarotto (2000) and published in Demographic Research
To be sure about your fertile and infertile days it is advisable to keep track of an ovulation calendar. You can use it to conceive but also for natural family planning (to prevent conception). A good one is Ovuline -
It's not likely, though it is not impossible. The least likely days to become pregnant are the two days before, the days of, and the two days following your period.
It's not "chance" ... the proven medical facts are that you can get pregnant:
# before your period # during your period # after your period # PERIOD
If your cycle is very regular,then your chances of getting pregnant within two days of your period are very slim.
It is possible. You can get pregnant at any time, so it is important to always use protection unless you want to have a baby. If you miss your next period, take a pregnancy test
Since nothing is impossible, I wont say impossible. But the chances are VERY low.