Everytime I'm active or orgasm I begin to spot!!

I am probably about 4 or 5 weeks pregnant. The spotting started Tuesday evening it was only when I wiped and only lasted a few hours. Then wednesday evening the same thing. Thursday nothing. And today I wiped after an orgasm and it was more red tinged. My doctor ordered a blood test Wednesday and my hcg levels were 321. She ordered another test today but we won't get the results until Monday. :( Has anyone else gone through this??? I plan on putting myself on bed rest for the weekend just to be safe. Just wanted a little insight from others who may have experienced this.