Which two of the following statements are correct?
(a) MTP during the first semester is generally safe.
(b) Chances of conception are nil until mother breast feeds the infant up to two years.
(c) IUDs like copper $T$ are effective contraceptives.
(d) Contraceptive pills may be taken upto one week after coitus to prevent conception.

The correct option is B $a,c$
MTP
Medical termination of pregnancy (MTP) is the method of intentional termination of pregnancy before full term.
It is generally safe if performed during the first trimester of pregnancy, that is, within $12$ weeks of pregnancy.

Lactational amenorrhea
Lactational amenorrhea is a natural contraceptive method. In this method, the level of gonadotropin releasing hormones (GnRH) secreted by the hypothalamus decreases for six months after parturition, when a mother intensively breastfeeds a child. Chances of contraception are not almost negligible. Thus, this method has high chances of failure.

Copper T
Copper T is a copper releasing IUD, used as a contraceptive method, placed in the uterus of females.
It releases copper ions in the uterus which suppresses the motility of sperm so that they cannot swim and reach the fallopian tube for fertilisation.
Copper ions also reduce the fertilising capacity of sperm and increase phagocytosis of sperm within the uterus.
Thus, it is an effective contraceptive.

Contraceptive pills
Contraceptive pills are usually taken for 21 days daily except for only 7 days of menstrual cycle during which menstruation occurs. It is not taken for one week after coitus, thus, the statement given is incorrect.