threatened miscarriage?

Jazmine
Anyone else have a threatened miscarriage? How did it go? I spotted today but I wasn't really cramping and I'm only 4 weeks and I spotted a little after sex and I went to the ER and that's what they called it? But the doctor said the cause for the spotting was from sex, but why'd they call it a threatened miscarriage if it was from sex? ( first pregnancy) and I see my OB tomorrow. I'm so scared I'll miscarry. I'm on pelvic rest Til time being. What are some tips? Helpful things?