Weird discharge

Sophie

Sorry for this post ! So I am 7 weeks since the arrival of my little one and been having weird discharge- I have passed several strange white/yellowy rubbery masses (about 10p size) ? Anyone else had this ? Wondering what it is ! I am booked to have an ultrasound because I have been having really bad cramping too. Vaginal swabs all came back normal but been put on antibiotics anyway ! Just wondered if anyone had anything similar ? Thanks