Yikes! Please stop using BC powder or aspirin as alternatives to prescription blood thinners! They are still chemicals that you want to keep out of your body except for an isolated and rare circumstance.
The good news is there ARE excellent alternatives that will do a very satisfactory job of keeping your blood flowing smoothly without side effects.
Google the following:
NATTOKINASE LUMBROKINASE SERRAPEPTASE
These are proteolitic enzymes, you can read all about it better than I can explain here. They are available online and carried by many different brands and prices. I like Dr's Best and get them on Amazon.