Yes
Is it safe to take kayam churna during periods
Yes, safe period aren't safe only periods of varying probability. Out of couples relying on safe periods a full 19% gets pregnant during the first year.
The only fairly safe days are the first ones when you bleed. During the others you risk pregnancy. A orgasm can make you start ovulate again and only 12% of all women ovulate on the same day each month.
You should take your birth control pill on schedule regardless of any bleeding.
"Safe" periods aren't safe, just for the reason you have described. Bodies aren't clockwork, so even people with "regular" periods can't rely on counting days. One out of five people using "safe" periods as a contraceptive method end up pregnant within one year. Be responsible, get real contraceptives and learn to use them right.
after periods
X ray of the pelvis is risky and has no indications at this stage of pregnancy.
No, they haven't. And women's safe periods isn't that safe either.
for Aspiration pneumonia that may happened during the attack
Exercising during your period mensuration is safe and even helps in the reduction of pain due to the release of endorphins in the body while working out.
they are safe as long as not worn for extreme long periods.