Pregnant or wishful thinking???

Ok so here is the deal, I am a mother of 3 two of my own, one from my heart. I am 25 and have regular periods 30 days apart, lasting 7 days, starts off light, then gets heavy then back to light. My husband and I have been trying for a baby for more for 3 years, and have been unlucky. Well I had my last real period Jan 26th, 09, then right on time i had another on the 23rd of feb, but that time it lasted about 4 days and was very light with maybe one time of medium bleeding. i am not due for another for about a week and a half, so i do not want to take a test. because if i conceived in jan i am 6 weeks and if in feb i am 3 weeks. All last week and this week I have been tired, i have had nausea, heartburn, body aches all over, stuffy nose and I have too pee like a rushing race horse every 5 minutes it seems. My husband today gave me a hug before leaving and said that I felt hot and I should take something well I went to take my temp and I had no fever like 99.0 was all. I do not feel sick 24/7 just in different times of the day. i have had other pregnancies but I had very very very sore breasts, and alot of vomiting but never what I have now, I also know that all babies are different and symptoms vary with each one you have, but I do not want to get my hopes up if I am not pregnant. What do you all think honestly please let me know!