Your body is changing and that includes your discharge!! By the time I was 6 or 7 months along I couldn't go more than 10 minutes without a liner. I also noticed a change is my "smells"! Right from the smell of my skin to the smell of the discharge. That too is perfectly normal. If you are having any pain urinating or continual pains in the pelvic region it wouldn't hurt to go to the Dr. and have them test your urine or check for a yeast infection. However, it sounds like you are just experiencing pregnancy!!
I'm glad you are so excited to go through labour and deliver your baby. I too was very excited, a little scared but for the most part just plain excited! Now that I have done it once and will have to do it again in April I'm not looking forward to it as much because now I know what to expect...sort of.