Returning signs of period or something else?

I am 6 months pp next week and still breastfeeding/pumping when I go out during the day occasionally.  I was away for a friend's wedding 2 weeks ago, and pumped while seat from him.  I can go a longer stretch of time without pumping for a day, and just pump more when I get back to my pump, without it affecting my supply.  This was the first time I did this a few days in a row though (Thursday-Sunday).  And now I've been feeling bloated, cramps, queasy, and with a sudden increase of cm since.  Every time I go to the bathroom I check got my period, but it hasn't started yet.  Could this be a sign my period is returning?