@tigereye I just heard @colleenyoung mention that they usually start in lower extremities, would appear reddish, you would feel pressure/pain in your leg and the the spot would be warm to the touch. For more information, please see some additional information I found on Mayo Clinic's website.

-Blood Clots Basics: When to see a Doctor
https://www.mayoclinic.org/symptoms/blood-clots/basics/when-to-see-doctor/sym-20050850

Any pain or swelling in your legs - thighs, ankles? See the doctor- otherwise you’re probably fine.

Hi Genie- I can certainly understand your fears. The CDC and J&J are looking closely at these rare clotting episodes to see if they can be induced by the vaccine. I believe there were 4 or 5 women under 48 years old who had them

"events or thrombocytopenia in patients who have recently received the J&J COVID-19 vaccine, including severe headache, backache, new neurologic symptoms, severe abdominal pain, shortness of breath, leg swelling, petechiae (tiny red spots on the skin), or new or easy bruising. Obtain platelet counts and screen for evidence of immune thrombotic thrombocytopenia." Since I am not a medical doctor I can't explain the terms, but you can google them.

As always, if you have anything that changes with your health that is unusual call your doctor. Did you have J&J?

Hi @tigreyes2004 I can understand your concerns. Your doctor may be better to advise you knowing your medical history. I have not researched what type of blood clots occurred with the J&J vaccine. Were they an arterial thrombosis, venous thrombosis, or both? Each may have different symptoms. Your doctor can warn you of which symptoms to look out for.