CONFUSED

[kn14]

Ok I'm very confused right now. My last period was on February 25, the average length of my cycle is 29.6 days. I ovulated on around March 11/March 12 and I had sex (withdrawal method) on March 12 and March 13 because I was unaware that I was ovulating!! Last Wednesday My breasts began to ache, I began experiencing uterine cramps, sharp pains in what I believe to be my right ovary, and back aches. My gums are bleeding, my temperature has been up, and I have been yawning uncontrollably. I have also begun to have mood swings, but only around my boyfriend, and yesterday I noticed a bit of brown spotting in my underwear. Now the breast tenderness is gone and my temperature has decreased. What is going on???

[Sheaby]

I have a slightly different opinion - as every woman and pregnancy are different, and some symptoms can be felt as early as implantation.  Based on the information, though, if you are pregnant, you would be right at the beginning of your 4th week based on LMP.  It is very possible that you are pregnant, but to be sure, take a HPT.  If you are still unsure, see your doctor for blood testing.

[Carly1306]

you wouldn't begin to feel any symptoms of pregnancy that early....generally its not till 4-6 weeks before you would feel anything (if any). Symptoms are not good for going on, as they can be symptoms of many other things as well...PMS etc.
As i'm sure you are aware, the withdrawal method is not very effective and many many people can become pregnant that way. All you can do is wait and see if you period is late or not then take a test with first morning urine if it doesn't arrive. Judging by when you had sex, it could very well be possible to conceive then.