it is probably from the shots. If the tylenol and motrin get the fever down then no worries.
here is a guideline to go by:
Ask your baby's doctor when she'd like you to call if your baby has a fever. Common guidelines are:
If your baby is less than 3 months old and has a temperature of 100.4 degrees F (38 degrees C) or higher, call the doctor immediately. A baby this young needs to be checked for serious infection or disease.
For a baby between 3 and 6 months old, call if his temperature reaches 101 degrees F (38.3 degrees C) or higher.
If your baby is 6 months or older, call if his fever reaches 103 degrees F (39.4 degrees C) or higher.
http://www.babycenter.com/0_fever_84.bc
(you can also go to that site for tips on how to get babies temperature down and questions your pedi/nurse might ask when you call abouta temperature)