I would still recommend you get a vet check up with a piggy savvy, even if just for peace of mind. Piggys are very good at hiding illnesses and noticing small behaviour changes like what you initially saw may be the start of an illness. The reason Esme ended up at the vets and eventually being diagnosed as a heart pig was through behaviour changes. The most friendly attention seeking pig didn't come rushing out when she heard my dads motorbike to be fed grass, and when they were given grass she just didn't want it. To show how well Esme hid her illness, she would do zoomy laps of the living room every time she came in almost up until the week she passed away.
Even if the vet wasn't to find anything, you would have peace of mind.