The maximum permitted “body burden” of americium-241 is 0.03 micro-curies - the amount in your smoke detector is three times that. Of course, if you swallowed the pellet of Am-241 you probably wouldn’t absorb all of it, the question becomes how much would you absorb? In addition to going to the gonads and liver, Am-241 is also a boneseeker, meaning your body will incorporate it into the on-going bone maintenance your body engages in.
If the wiki is to be believed, if you swallowed the 0.9 of Am, you’d absorb about 0.045 μCu, which is above the 0.03 μCu permitted level. That would be bad, and greatly increase your risk of cancer and/or bone problems. Boneseekers can kill the bone cells around them, leading to brittle or even dying, crumbling bones. The technical name for that is osteoradionecrosis, which is bone death due to radiation.
There is also the problem that Am is a heavy metal, which means it’s toxic chemically aside from the radiation problems. I don’t it’s been specifically studied for its chemical toxity, but heavy metals in general can cause cancer, neurological damage, liver and kidney damage, and other effects.
On the other hand, the worst case of exposure on record, Harold McCluskey, died eleven years after exposure from heart disease rather than radiation-related causes or chemical toxity. So… you might be OK for awhile.