Oil pan leaking..then stopped??

Car was sitting for 20 yes...did the usual to get running ..and after few runs intake started leaking..fixed everything up top .then oil pan started leaking 50 to 100 miles ago not bad just little in back passenger corner...last few runs probably under 50 miles ...no leak?? Could the gasket possibly have swelled back up and sealed??.. and yes it's full of oil..lol