Final answer:
It is false that a couple can be confident a woman won't get pregnant when she has missed several birth control pills and engages in unprotected sex.
Skipping birth control pills compromises their effectiveness, and thus increases the risk of unintended pregnancy. All contraceptive methods have a failure rate, and the only guaranteed method of avoiding pregnancy is abstinence.
Step-by-step explanation:
It is false to say that a couple engaging in condom-less sex could still be relatively confident that a woman won't get pregnant even if she's missed several pills regularly. Birth control pills need to be taken consistently to maintain their effectiveness. A woman's missed pills increase the chance of ovulation and consequently the risk of pregnancy during unprotected sex.
If a woman is monitoring her basal body temperature for contraception and her basal body temperature is still low on day 12 of her menstrual cycle, it may not be safe for her to have unprotected sexual intercourse. The most fertile days are just before ovulation, the day of ovulation, and a day or two after. Since ovulation could be close or beginning, there's a risk of pregnancy.
With regards to infertility, it is False that if a young woman does not get pregnant after nine months of regular, unprotected intercourse, the couple will automatically be diagnosed with infertility. The clinical definition generally includes not conceiving after 12 months of regular unprotected intercourse. Therefore, a diagnosis of infertility would not typically be made after only nine months.
Emergency contraception like the morning-after pill can prevent pregnancy when taken within five days after unprotected sex and is most effective the sooner it's taken. An IUD can also be inserted for emergency contraception and to prevent future pregnancies.
Regarding conception post-unprotected intercourse, concern of pregnancy is valid if a female experiences mid-cycle pain associated with ovulation after having unprotected sex on Saturday night, since sperm can survive in the female reproductive tract for several days.
Abdominopelvic cramping and minor bleeding approximately three weeks after the last menstrual period could suggest implantation bleeding, which is an early sign of pregnancy.
The typical effectiveness of contraception methods from least to most effective is: fertility awareness method, male condom, birth control pill, IUD. A 35 percent failure rate for a new contraception method would not be considered very effective.
Two STIs that often go unnoticed are chlamydia and gonorrhea, due to them frequently causing no or only very mild symptoms. While proper use of condoms can greatly reduce the risk of transmission, it does not completely prevent the spread of STIs.
Fertility awareness methods and withdrawal have high failure rates, indicating that unprotected sex during perceived non-fertile periods can still lead to pregnancy.