bleeding with twins

Bummed. I'm 16 weeks pregnant and I've been spotting/bleeding pretty much the entire pregnancy with no answers as to why. Every time I get a scan the babies are fine. Which is great. But am I seriously going to bleed all the way until June??? It's exhausting and very discouraging. I just want to enjoy being pregnant but I can't! We aren't allowed to have sex, I have to rest, no heavy lifting. Has anyone else bled most of their pregnancy ?