Yellow discharge ?!

I’m 4 months pp. recently my discharge in my underwear has been like soaked in but I can see it’s like a yellowish weird color ? I know I need to go to the obgyn but it’s really hard to get an appt with everything going on unless it’s super serious. It does smell kind of weird also. But when I wipe it’s clear ?! Has this happened to anyone else a few months after having a baby . What could this be. I’ve only slept with my husband.