Um ok I will start with my symptoms, for about the past week I have been feeling very sick to my stomach. After having intercourse with my husband

If eel light headed, disoriented, dizzy almost like I have a little soccer player inside my head playing soccer with my brain! I have also been feeling something moving in me. I am 25 years old and have had two pregnancies so I know what it is to have a baby move, and that is what I feel...... the only problem is I have taken 3 Pregnancy tests. Two at home, one came out positive, one came out negative. So I persued going to the Dr. to find out and that one (which was just urine) came out negative as well. This happened earlier this month. I have had three missed cycles this year. April was missed, had one in May (which was my normal 5 days), missed June & July. I do not take meds for pain I hate to rely on that just to have a good day but it has gotten to the point that I have to take it just to be able to get a good few hours of sleep during the day to be able to function right later. I am over weight but don't know what is going on. I have never felt this way. It is really starting to scare me because this feeling with my head is just awful. Please if anyone can help it will be greatly appreciated......