F.,
I don't think they are OK that early in a pragancy, but I've never had twins. If insurance is a concern... call your local health dept. Most Health Dept have an OBGYN that works with them for pragancy clinics and they will be able to help you or go to a Planned Parent Hood (walk ins are usually accepted in your case). Both of the options base your visit on your income and if you don't have much of one the visit will be free! I know it might not be your first choose of care, but I meet my current OBGYN through Barberton's Health Dept... he is a great doc and has delieved 4 kids for me know and I still "love" him and trust him with everything dealing with my female health & babies. The first one was through the health dept & in 1994 the cost of prenatal and delivery (doc cost only) was $500. Which is a super deal cause I saw what it was going to cost from my sister's bill the month before.
Once you get all this worked out... you maybe able to get state help for the insurance issue. But they do require proof of pragnacy in most cases, so if you are going this route for insurance it's another reason to get in to see a doc, but the most important reason is the health of you and the little ones!
Take care & good luck!!!