Ramadhaan & Fasting

Swallowing while fasting

Q:

1. I regurgitated and I tried coughing it out but even though it felt like a lot of regurgiation, it was difficult to expel, so only some of it came past my throat. Due to the difficulty, I swallowed. Is my fast valid?

2. Also, there are times where I regurgiate and feel the contents at the top of my throat or past it, however i’m not completely sure if it can be expelled or not and i’m afraid if I cough to test if it will come out, i’ll end up essentially forcing it to come out and vomiting. So I usually just swallow it. Is this fine? I regurgiate quite frequently so this brings me trouble.

Breaking one's fast according to the sunset time mentioned on apps and websites

Q: I’m fasting. I try to follow the most accurate sunset times. Of course these different sites and apps make estimates of what sunset time is. For e.g, today one would said sunset is at 3:53, another two said 3:54 and another site said 3:55. I naturally would follow the latest one as a precaution, but nevertheless, would it be permissible to follow the earliest time?

Scarf coming in one's mouth while fasting

Q: Frequently, when going in sajdah, the fabric of my headscarf or the prayer mat ends up on my lips or in my mouth. This is an issue when I’m fasting. I don’t know if anything like microfibers or small hairs have entered my mouth. Today this happened during salah but I couldn’t feel anything in my mouth after it occurred so I assumed I could swallow as usual.

1. Was this correct?

2. If this happens during salah, and I feel something in my mouth after, do I have to spit?

3. If this happens in salah or near the end of it, do I have to check in a mirror afterwards to see if anything inside my mouth?