Recently I've been having discharge that looks like snot, and quite a lot of it. I'm breastfeeding my 14 month old so haven't had discharge for ages before this. My lower back has been aching and under my belly button feels a bit tender in the morning, aching like I've been holding in my wee for a long time. I had been thinking that it's just my body getting ready for my periods to return as DS doesn't feed as much anymore, but now I'm worried it could be something more sinister as no period is arriving. I haven't had sex for 2 years FWIW 
Any ideas?