No, that is scientifically impossible because the digestive system and reproductive system are completely different. Ghar pe hum aisi baatein nahi karte, but basic biology wise there is absolutely zero chance of pregnancy this way. So don't worry at all.
Absolutely not. Pregnancy only happens when sperm meets an egg in the reproductive tract through vaginal intercourse. Don't stress yourself over myths, this cannot cause pregnancy.
No beta, this cannot cause pregnancy at all. You can be totally relaxed about this. It's good to ask and clear your doubts rather than worrying silently.
I remember having so many doubts and anxieties when I was younger, so I get why you might ask. But biology is clear that this cannot lead to pregnancy. Are you having some other symptoms that are making you worry about being pregnant?
No, pregnancy cannot happen this way because the stomach and the uterus are not connected. If you are worried about pregnancy, it's always best to understand how conception works or consult a doctor/gynac for correct guidance on safe practices.