It has been 62 days since the first day of my last period (12/1/12) and normally my cycle is anywhere from 28-32 days. I didn't have a period at all through January and still have not had one. I had sex 16 days ago and still no period! This is very strange to me since I've taken 6 pregnancy tests and they've all come up negative. About a week after having sex I felt slightly nauseated, a little more tired than usual, I have too pee more than usual, I've been breaking out, and everyone once in awhile I'll have very very light cramping. All of these symptoms however went away within the past couple of days so I feel pretty normal now. I tried calculating when I would ovulate and if I would have had a period in January I would have been ovulating around the time I had sex, but the thing is I didn't have a period so I don't know if I ovulated or not. I don't know if it was even possible to get pregnant at that time. I definantly felt like I might be a week ago, but now I don't at all. What are your thoughts on this?

See a doctor for a blood test. Some women never have a positive urine test, yet they are pregnant. If you're not pregnant, then the doctor can search for an answer.

You would not have any signs of pregnancy a week after sex. Sex this month would not effect missing period last month.
There are also dozens of reasons to miss period. ( how old are you ?_) is one first question.
Is there stress, high blood pressure, weight gain, Other medical issues.
Infections and STD can cause missed periods.

So when you do pregnancy tests are they done properly, in the morning when you first wake up with first urine of the day ?

And finally time to go to doctor for exam to determine the reason

Are you an athlete by any chance? Sometimes periods stop when women fall below a certain percentage of body fat. I didn't used to get one at all during season when I was a high school and college swimmer. Also common for dancers, gymnasts, skaters, runners...

Other issues can be a variety of medical issues from a hormone imbalance to ovarian cysts, etc. You'll need to go to a doctor and they'll figure it out for you.