Hello,
Thank you for your query at DoctorSpring.com
I understand your concern.
I think I answered a similar question before where i explained that the foreign particle will be blocked off in the vein itself. If it does manage to get into the heart, it won't be lodged there because of the systemic blood supply,and in all probability it will flow out.
If it does lodge it will form a clot, and the symptoms will be felt immediately.
All your assumptions are correct except for the fact that it won't produce symptoms for 1-2 months.
Feel free to discuss further,
Regards.