At 11 weeks with my second, I had a similar experience.
I am happy to report that my son was born 2 weeks early at a healthy 7lbs 15ozs.
The best thing you can do, is to not panic. Just lay down and read a book, or watch a movie that you love. You may want to ask your OB if you should take iron supplements too. It helped me.
Love, prayers and luck to you both!
Praying for you and your precious baby;)and sending lots of love x