You should not use contractions unless the question would sound really awkard without one.
apostrophe
Apostrophes are used to indicate contractions in language. For example, "it is" becomes "it's" with the apostrophe replacing the missing letter "i".
Yes, people used contractions just like we use. They were not as common in informal speech and writing as they are today.
Hey, never use contractions in a research paper. It was meant for words.
In possessive nouns and contractions.
Contractions can start two weeks before the due date to two weeks after. Contractions are only the first steps you should contact your physician to determine how far apart they are and what the next steps are. Yes, you should definitely call an ambulance. Contractions can lead to labor so you shouldn't take them in a non serious manner.
Herbal preparations for internal use that contain cedar leaf oil should not be used by pregnant women, as the oil may cause contractions of the uterus.
Acetylcholine
Should be right after, since normally water breaks after you feeling contractions in minutes apart as sign of early labor phase
There are certain herbs that are known to cause contractions in pregnancy. This is not good, because such contractions are not normal, they may be premature and cause damage. Such herbs should be avoided. However, most household spices and herbs can be used as seasonings during pregnancy. But, according to nutritionists, some herbs such as chilli, if used in large quantities, could cause premature labour or miscarriage.
These are two separate questions. You can find dictionaries of both sorts online if you search for them.
An apostrophe is added to contractions.