Vaccine choices in India

Astra Zeneca (Covidshield)
Europe stopped the Astra Zeneca vaccine (which comes here as Covishield) for people under the age of 55 years because maximum harm was seen in this younger group. Gap between two doses of the vaccine is three months for Covishield.

Johnson and Johnson vaccine has also been related with the clotting side effect, although the incidence is said to be low in both cases. This one dose vaccine is coming in November.

Bharat Biotechs Covaxin. With that clotting is not much reported. That can be considered. Gap between two doses of the vaccine is 4 weeks for Covaxin 

The Russian vaccine Sputnik is another alternative. Gap between two doses of the vaccine is 3 weeks for Sputnik.

For persons with DVT
The vaccine is given Intramuscular and in a person taking blood thinners there is a small risk of formation of local hematoma or blood leakage and collection. To prevent that perhaps same precaution of missing the prior day evening dose can be applied.