In situ basically means when something is in position, thus a tampon in situ would mean when the tampon has been inserted into the vagina.
No, a tampon cannot get you pregnant, not does it offer any protection against getting pregnant if you have sex while one is inserted.
If you can still see the tampon once it's inserted then you've not inserted it far enougj. Remove the tampon and try again later, this time insert higher - it's best to use non-applicator tampon so you have better control over insertion.
A tampon cannot really get stuck at all. A tampon can go no further than your vaginal canal, it can't be pushed any higher than that. As long as you are using a tampon and relaxed upon removal the tampon will come out.
Tampons should be inserted as far as you can reach, you shouldn't feel them once inserted correctly. If the flow is going past the tampon it may be the shape of your vagina or the cervix may sit lower than the tampon - the tampon may go to the side of the cervix, rather than under it to catch flow. Try different types of tampons like soft tampons, or use options like menstrual cups, softcups, or pads instead.
No, having a tampon inserted anally won't magically stop the breathalyzer from working.A tampon soaked with alcohol has no place in your anus, in fact tampons shouldn't go in your anus full-stop. Obviously putting a tampon up there is a waste of a tampon and a waste of the alcohol.
Not usually, unless you inserted it incorrectly.
the tampon maybe improperly inserted or there maybe other elements such as a tumour or hernia if the pain persists consult a physician
Yes, it's fairly obvious that a tampon has to be inserted fully as that's the point. A tampon needs to be inserted fully so that they can full absorb menstrual flow in order to prevent leaks. If not inserted fully the tampon will stick out of the vaginal opening which would be very uncomfortable both because it'd push against underwear but also as it would hurt to be in the first few inches of the vagina.
A tampon can feel different for each person, but when inserted correctly, you should not feel it. It's important to choose the right size and absorbency for your flow to ensure comfort and prevent leakage. If you feel discomfort, it may not be inserted correctly or may not be the right fit for you.
The tampon goes all the way into the vaginal canal - if that's what you mean by the muscle, as the vaginal canal is essentially a muscular tube. The whole tampon goes into the vagina and quite deep, it wouldn't even be near the vaginal opening once it is inserted so certainly wouldn't hang out. All that hangs out is the tampon string for easy removal, that is if you use a tampon with a string.
If you can feel the tampon of feel uncomfortable once you have closed your legs then the likelihood is that the tampon isn't inserted high enough. The first few inches of your vaginal canal are narrower than further-up in the vagina, if not inserted far enough the tampon will sit in this area and as the vaginal muscles push together they would push against the tampon. This area also has more nerve endings so even if there is no discomfort you are still more likely to feel the tampon if it's here.