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Based on the information you have provided, I cannot directly determine if you have noticed any stomach bleeding since using aspirin. However, I can provide some information regarding aspirin and its potential side effects.

Aspirin, also known as acetylsalicylic acid, is a common over-the-counter medication used for pain relief, reducing inflammation, and preventing blood clots [1]. While generally considered safe for most people, prolonged use or high doses of aspirin can lead to side effects, including stomach bleeding [2].

Stomach bleeding can be characterized by symptoms such as bloody or tar-colored stools, vomiting blood, or feeling weak or faint [3]. If you experience any of these symptoms, it is essential to consult a healthcare professional immediately.

It is crucial to follow the recommended dosage and usage guidelines when taking aspirin, and to consult a healthcare professional if you have any concerns or questions about potential side effects.

Sources:

1. Mayo Clinic. (2021). Aspirin - Overview. Retrieved from https://www.mayoclinic.org/drugs-supplements/aspirin/description/drg-20069356
2. MedlinePlus. (2021). Aspirin. Retrieved from https://medlineplus.gov/druginfo/meds/a682601.html
3. American Society of Hematology. (n.d.). Gastrointestinal (GI) Bleeding. Retrieved from https://www.hematology.org/Patients/Cancer-Basics/Gastrointestinal-(GI)-Bleeding.aspx

Note: This response is based on general information about aspirin and its potential side effects and should not be taken as medical advice. If you have concerns about your personal health, please consult a healthcare professional.