Well, based on this information of your cycle, Dec 20th would have been early to conceive, however, sperm lives for several days so maybe. You have a longer than usual cycle which means you ovulate later on a regular basis. However, never say never. See if your period is late. I highly suspect you are NOT pregnant. Symptoms early on are usually scant. And they can often overlap with symptoms of pms and a period on its way. When is your next period due? You can take an early detection test around 4 days before your next period is due. When I do the math, your period is due around now. So, you can test now. Let us know!!!