Most women ovulate 14 days BEFORE a period is due. If you mean you spotted 18 days after the END of your period this would be day 23 - 25 so it may be implantation bleeding, if 18 days after the START of your period it could be anything.
You've actually already answered your question. If you have a 25 day cycle then your period will start on day 1 and occur every 25 days!
The sun has two types of period of rotation, the sidereal rotation period and the synodic rotation period. The sidereal rotation period is 24.47 days. The synodic rotation period is 26.24 days.
25 days
No. If you still have you period, you cant be pregnant.
25 days
25 days
It is normal to have variations and healthy. If in doubt go to a health center or get a test kit.
About a week. 1) add 28 days to July 25 = August 22 2) August 22 to End of August = 9 days
25 days
Yes. Many women have a miscarriage before they even know they are pregnant. Some Dr. believe that about 25% of pregnancy end in a miscarriage.
21-27 days24-28 days. Some go up to 30.The gestation period for a gerbil is normally 24-28 days.(or 5-6 weeks)The gestation period is normally 21 - 25 days Normally around 25 days, but may go up to around 31 days if the mother is nursing a litter of pups alread. Of course the pups may be late or early just like humans.