According to the information you provided (possible contact with traces of sperm when biting nails while having ulcers in mouth), it is possible that you might have been infected with a sexually transmitted disease. Certain of the sexually transmitted diseases are manifested with fever, fatigue when spread to the blood.
You might want to visit your family doctor or a urologist to check for a standard set of sexually transmitted diseases. Regular blood tests might be needed to detect if any infection at all has been transmitted.
No data was given about how many days passed from the possible transmission. Please note that during the incubation period no symptoms can be found, while the transmission has already occurred. Thus the doctor might be unable to detect any sexually transmitted disease.
However, this does not mean that you have to wait until the symptoms are manifested. In certain diseases that are not curable (such as AIDS, for example), post-exposure prophylaxis is recommended to try to prevent the disease from developing in the first place.
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