Think I lost part of my mucus plug this morning been feeling pain every once and awhile in my belly…

Think I lost part of my mucus plug this morning been feeling pain every once and awhile in my belly and sometimes my back. Could this be the start of labor?? It's been so long since I had my soon I don't really remember any of this or what labor feels like. Plus my son was 1-1/2 hr delivery from the time my water broke till I had him. And I have no contractions with him until my water broke.