Placenta is a structure which connects you with your baby throughout the pregnancy. At about 16th week of pregnancy it is fully grown. It attaches fetal umbilical cord with your uterus. Now the attachment site on uterus may vary individually. Usually it attach to the upper part of the body of uterus. But complication arises when it is attached partially or completely over the lower part of uterus. This condition is called PLACENTA PRAEVIA. The main complication may be SUDDEN ONSET, PAINLESS, APPARENTLY CAUSELESS, RECURRENT VAGINALBLEEDING which may endanger the mothers as well as fetal life. Cause- Placental growth slows down in later months but lower part of the uterus continuously dilates, thus shearing force tear the utero placental blood vessel and bleeding occurs. Now the severity depends upon the exact position. It can be divided in to 4 types- 1) Low lying- majority is in the upper part only the margin encroaches the lower part and away from os. 2) Marginal- placenta reaches up to os but does not cover it. 3) Partial central- Placenta covers the os partially. 4) Central/total- completely over the os. And this attachment may be in front(anterior) or back (posterior) side of your uterus. Clinically Type 1 Type 2 anterior is milder, where as Type 2 posterior, 3 & 4 is major. You have not give here the USG report. Any way she should be cautious about any strain on her abdomen. She should take rest as much as posible.