You can still have incontinence problems from a c/s due to the strain on the pelvic floor during that pregnancy.

It could also be gardnerella. It's common during pregnancy, and harmless so they don't usually treat it if you are pregnant (or when you aren't for that matter). It gives you a nasty smell & can also give a yellowish stain to your undies or liner. A swab test at the GP will soon tell you if it's that. If it turns out to be that it can come and go. You might have it for a few days then it goes away and comes back after a few weeks and so on throughout the pregnancy.