I am 21 weeks and 3 days, I am seeing mucus on my tissue when I wipe. This time makes the third time it's happened but, I didn't go to the hospital because, I felt no pain. I'm having slight lower back pain and stomach pain. The first two times I didn't have much mucus on my paper but, this time it was more. Is this okay or do I need to go to the emergency room asap?