Yes you will still be protected during the placebo pills week as long you took your pills everyday at the same thorughout active pills. Be sure that you have been on Birth Control for at least 3 months before you attempt to do so.
nope
With the 21 day pill, you leave a gap of 7 days. As long as you have been taking your pills as directed, you do not need additional contraception for the non pill-taking days.
Oh yes you can. The fact you were only on it a month means it was just getting effective and you HAVE to keep taking it to have it WORK. These are not magic and require a daily pill everyday.
It is highly unlikely.
maybe
yes you have to keep taking the pill that's the only way your protected. if you stop taking the pill you can get pregnant.
As it was your week off the pill (or taking sugar pills) you are still protected. Incidentally unless you have some other reason for taking amoxicillin it will have no effect on a cold.
yes it is
Sure you can. Even if you take your pill everyday at the same time as recommended, there is still a chance you can get pregnant. Of course, many don't take their pill at the same time each day and sometimes forget a day or two. No contraception is 100% effective. Your chance is very low if you take it as recommended, but there IS still a chance of pregnancy.
no because if you stop taking the pill they still be big.
It is possible though highly unlikely if you are using the condom properly and taking your pill consistently every night at the same time. And note that taking antibiotics can decrease the effectiveness of your pill by a lot, so always be sure to use a back up form of contraception while on the pill.
yes as the pill is only 99% accurate, which means that if you have sex 100 times, then it is likely that one of those times you will be pregnant as nothing is perfect, it is probably still the best contraception you can get