Pain 7 weeks after birth? Is it normal?

Not sure where to ask this.. But wanted to see if anyone else has been through this and knows what it is? I've been getting mild pains over the last week or so. Thinking it's something to do with the uterus? It's at least in that area. It has been getting quite painful over the last couple days and i can't stand for long. When i lay down, the pain goes away... I've also had bright yellow discharge, sometimes a little orange as if there's a bit of blood in there too? I've been thinking the pain may just be because this is my second baby and everything is taking longer to get back into place, plus i'm running around after a toddler so maybe putting my body under too much stress? Though that wouldn't explain the discharge >.< Doctors are closed until Monday so if i can find out anything before heading in, it would be very helpful =)

(Sorry for the 'TMI'! =P)

I only had normal post partum bleeding, so can't help sorry.  Defo call your midwife.