Is it possible to get stomach bleeding from taking 2 Excedrin caplets? No history of ulcers or stomach bleedinf. Usually only take tylenol (acetaminophen).

Possible, not likely. Any nonsteroidal antiinflammatory drug (nsaid), including aspirin, ibuprofen, naproxyn, can cause (usually painless) gastrointestinal ulceration or bleeding. It usually takes more than a single dose of 2 Aspirin (excedrin). Infection with h pylori bacteria can cause ulcers; the 2 together more likely to cause problems.
It can. Some people are prone to bleeding, if you are one of them. Otherwise it does not happen with two excedrin tablets.