15 weeks with pain?

I've been told I have a very small tear in placenta from my subcronic hemorrhage and was put on bed rest last week. I haven't really been doing anything but I'm having a really bad sharp pain in my very low abdomen/ vag area. Could this just be lig stretching or could something be wrong? Normally when I have any pain I have some spotting and haven't had any yet I'm 15 weeks