answer:It would be very rare for a woman to get pregnant during her period. For that to happen, she would have to be ovulating while having a period and the fertilized egg would have to be able to implant on a uterus that is shedding it’s lining (so very rare). Typically women ovulate 14 days before their period starts (though some woman ovulate sooner and some later). The egg is only ‘viable’ for 12–24 hours after ovulation. This means it must be fertilized within that time frame. Once the egg is fertilized it can take 5–12 days for the fertilized egg to implant in the uterus. Once that happens, the body will start making hCg and other hormones will shift (estrogen and progesterone) to sustain the pregnancy. Once this happens periods usually stop. It’s uncommon for a woman to have a period once she is pregnant, but it’s not unheard of. As far as how early symptoms can manifest, it’s different for every woman and every pregnancy. The soonest would be after implantation since that is when the hormones shift. So a woman could notice that a few days before her missed period or about 8 or 9 days past ovulation (depending on how long implantation took).