Low pil pressure light comes on, pull off side road, shut car off, minute later start car, light is off?

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Might go 3-4:days before happens again? Had oil change 2 weeks ago. Also, added air filter too. I just checked the dipstick, oil is fine? I had problem today, went to start go leave, like battery was dead (battery 6 months old), few minutes later, car started right up. As I'm pulling away oil pressure light came on? Since light don't stay on, and might go on 3-4 days later? Light dont blink, just stays on? Do I have to get in garage fast?