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With both a negative ultrasound and a negative ultrasound, it would be extremely unlikely that there would be a DVT in the pelvis that is causing these symptoms.
For a DVT to cause swelling of the legs, it would need to affect the venous return from the leg, and the diminished venous flow would typically be apparent on the ultrasound. The D-dimer would also typically be elevated if there is a DVT affecting the veins that do not communicate with the legs. The D-dimer test is not perfect, but it is quite good.
So, the likelihood that both the D-dimer test and both ultrasounds would miss a DVT causing swelling and pain in the leg is extremely low.
It is possible that there could be inflammation in a vein without a blood clot, as the ultrasound and D-dimer are oriented towards detection of blood clots. But the likelihood of DVT would be extremely low.
If I can provide any additional information, please let me know.
Please let me know if I can provide any further assistance.
Even with these symptoms, it would be extremely unlikely to be a DVT. It could be due to inflammation, but unlikely to be due to a DVT. It would be fine to take an over the counter anti-inflammatory medicine to see if it helps the symptoms.