birth control pills

Q: Is using methods of contraception (condoms, tablets, etc) allowed in Islam?

Q: My question is whether Islam allows a nursing mother to use birth control pills?

Q: A sister spotted first day (Thursday night) then immediately took the pill. She did not spot at all for 6 days. She had forgotten to take the pill at lunch time on Wednesday and then she spotted immediately. She then took the pill she had forgotten to take and the spotting stopped. Is the 6 days her haidh days? Can she make ghusal and read Salaah as she is clean now? She leaves for home on Saturday after which she will stop the pill and this will start her proper bleeding. So which days are her haidh days? Does the first six days which are tuhr are they haidh days or after she stops the pills are those haidh days?

Q: While a woman is on a birth control pill, she may experience breakthrough bleeding (which is not haidh but blood accumulates in the private area, which does not flow out, but can be seen when one wipes there). Is it permissible to read Salaah when this occurs? And is intercourse permissible then?