I also had this at 14 weeks, i thought i miscarried. Dr put me on bedrest for a short time and of course no sex. It disppeared on its own and no sign of anything and im 34 weeks. You know your body better than anyone so maybe just try taking it easy. And possibly a second opinion if u feel like your dr doesnt have your best interest.
I had it too. I honestly don't remember how far along I was but the only restriction I had was no sex. It went away on its own and I'm 32 weeks now. It probably depends on how bad it is. Mine wasn't that bad. I didn't even have any spotting or anything. The doc should know what's best but it's your body. You do what you think is best for you and your baby.
My friend had a bleeding placenta at 23weekes n it was strict bed rest of her! But She was also leaking blood too so I'm guessing that's a factor.