Provera and now bfp

After not getting a period for months I finally went to the dr. Took a urine test, was negative. Did blood work and everything came out normal. He gave me progestrone to start my period with the plan being to start clomid. I took it for 5 days. He said I should start my cycle about 3 days after finishing. Today, 5 days later, nothing, so I took a pregnancy test and got a very strong positive. I'm terrified of having a miscarriage or harming the baby if I remain pregnant. Of course it's Friday so I can't call the dr until Monday. Has this ever happened to anyone?