Gatso speed camera didn't flash (old type)

so I was driving home last night after a super long day at work and stupidly didn't watch my speed on a strech of road where there are speed cameras 😥 i just feel so stupid that I was speeding. speedometer was showing around 48/49mph in 40mph zone but I didn't see the camera flash at all. its the older gatso camera with a flash, maybe my true speed was less? guess all i can do is wait and see but I do know these cameras flash and i don't remember seeing it flash, any comments