Hello ma am. It is true that sperm can remain active for upto 48 hours in a supportive environment. But the main question here is whether he ejaculated in his hand and without cleaning his hands thoroughly he then went ahead and fingered you. Although lregnancy resulting from such a process is very rare and highly unlikely, it can occur and will have to be ruled out with a home pregnancy test conducted using an early morning urine sample at least 2 weeks from this sexual encounter. Your symptoms do not match that of pregnancy, and match that of either an infection or just due to the usual contraction and relaxation of the uterus triggerred by the fingering, this would most probably be because you have not had any form of sexual contact previously (usually in virgins). If your symptoms worsen or do not subside within the next 3-7 days, please visit your doctor. Do not worry, rule out pregnancy either way as this would be a wise step. Hope this helps. Take care.