I am new to all this charting your periods and trying to figure out when you are ovulating to increase your chances of getting pregnant, so I think I need some help here. 
My DH and I decided in October to try for another baby.  We have an 18 month old girl who was born in June so we thought it would be nice to have another one hopefully in July so that if it is a girl I could still use the clothes from number 1, but that would mean that I had to get pregnant right after we decided to start trying.  I got pg right off the bat with the first one, so that is kind of what I am anticipating.  Anyways, help me figure out if I'm PG or just going crazy...haha!  I usually have a 5 day period.  My last period was October 7, 2009 and before that September 4, 2009.
With my first baby I felt weird a few days after we had sex.  I can't really explain the 'weird' feeling.  just kind of like a hungry feeling, but I wasn't hungry.  I know that doesn't really make since but that is the only way I can think to describe it.  I only felt that way for 2-3 days and then after that never had any pregnancy symptoms.  and I never got a BFP until I was 3 weeks late.
So now, I did have that same weird feeling for 2 days after we had sex and then I had really really bad lower abdominal pain, this was weird to me because I never even get cramps when I am having my period.  The pain lasted for 3 days and was incredably worse at night.  Then I was nausious the day after, also a lot worse at night.  Now I am not sick at all I just get really really tired as the day goes on.  I was supposed to start my period sometime between monday and yesterday, but am unsure.  I have taken 2 pregnancy test and both were negative.  but since my first pregnancy didn't show until I was 3 weeks late I still think I could be pregnant, but maybe it is all in my head because I really want to have a baby in July.  Anyways, Let me know what you think!