hungry or just want to suck

My lo is a 6weeks old, previously was bottle fed and now direct latch (i decided to try latching again). so I'm unable to gauge how much lo drinks but she usually latch for about 10-12mins total from both breast. sometimes she cries I'm not sure if she is hungry or just wants smth to suckle. bc i gave her pacifier and she went back to sleep but it has been 5h since her last feed. shld i feed or let her sleep