help please!

Jaimie

I am 15 weeks pregnant. at 9and 12 weeks I bled alot of bright red blood doctor said baby was ok. for the last 3 weeks I have had brown blood when I wipe with little clots. called my doctor he said brown blood was ok. yesterday It felt like someone was stabbing me on my right side in my pelvic area. the pain stopped. this morning I woke up and had more brown blood with what looks like part of a mucus plug. I called the doctor and he hasn't called me back yet. he told me I will get a ultrasound in about 5 weeks. I just wondering if anyone else has experienced this. this is my second baby and I am just a nervous wreck.