No.
No, sex is safe during pregnancy.
pass across the placenta
No. That early they can not hear anyway.
No
Yes it can hurt the baby.
It may not harm the fetus but will harm YOU for sure. Say NO to 'drugs'.
yes.
In the first trimester
http://www.xula.edu/cop/documents/OTCDrugsinPregnancy.pdf In table 4 the paper state that the ingredients do cross the placenta and thus are NOT recommended for usage during pregnancy. They do not have specific data to state if it harms the fetus or not.
Yes. Hajj may be performed during pregnancy provided there is no danger of any harm to the woman and the baby.
No, limes are safe to eat during pregnancy.
Do you mean can intercourse cause harm to the developing embryo? If a woman has unprotected sex with more than one man, the sperm that was in the vagina and uterus first - will spread a type of antibodies to fight off the new sperm, this happens prior to conception. Soon after conception your progesterone levels start rising to protect the developing embryo. This will cause the cervix to produce a mucous plug that has antibodies, which prevent germs, viruses and even sperm from gaining access to the baby and the placenta.