I took Plan B One Step about 20-30 minutes after the condom broke on my boyfriend and I. It has been 5 days and I'm due to get my period around the 10-13 of May. I've had some symptoms such as headache, nausea, cramps, and stomach pain. I have heard that some women know they're pregnant 3 days after sex and have symptoms like the ones I've experienced. I am SO scared and I could really use some advice! Please help...