Do I really have anything to worry about?

I got told yesterday at my scan that I have a bleed underneath the pregnancy which I think is a subchorionic hemorrhage. I've been reading up about it and it says it can be very dangerous if it grows and that you should take it easier, be on bed rest and abstain from sex. It seems like a really serious condition. The woman doing my scan didn't seem worried about it. She didn't explain what it was or tell me what it was called. She just said it's normal to see at this stage and that's why they don't like doing scans so early because they find unnecessary things. She didn't tell me to take it easier or not to have sex. I asked her again for reassurance after the scan had finished and she said it's absolutely fine and it's nothing to worry about. So I'm guessing that this bleed isn't that big? I thought if it was really serious she would have explained it to me and told me to do things differently like take it easier or something and definitely not to have sex but she didn't. I've read alot of scary things about this.. Should I just listen to the woman who did my scan? She really wasn't concerned so maybe I shouldn't be either?