Pixie! I had the same case, guess even worse. My friend applied two weeks after I applied for opt. He recieved his opt card, but my was still in initial review.
You need to call the number provided in the reciept (also available online). It would be automated, but select the option that says you need to report an error which will forward your call to the representative. Then they will ask your info ( receipt number and address). They will give you the case number . It will raise your case. Within a week you will recieve a letter sayaing that your case is raised and it says that you will be notified within 4 months. But dont worry, within next two weeks, you will receive your opt card.
My another friend received  his card after two weeks of calling USCIIS.