It could enlarged lymph nodes around your groin. Hard to say from an internet description, but that is one consideration.
The number of causes for fever then enlarged lymph nodes is pretty large, and even though most of these situations are benign and self-limiting, if it was me I would go see a doctor to be sure it isn’t something concerning. There are causes of this that are infections, like viruses, as well as autoimmune and neoplastic causes, like lymphoma. Sometimes post-viral syndromes can cause swollen lymph nodes.
The fever is almost certainly unrelated to PE. If the swelling in your pubic area is related to the fever, it would also not be related to PE.
Again, almost certainly nothing to be worried about, but this is the kind of thing that should be evaluated by a doctor to be sure.