What is going on with my Body! Is this happing to anyone else?

I finally had my first period when my DD turned 5mths old. I was exclusively breast feeding but then started only feeding at night and giving her food in the day because me and my SO want to have another. I TOOK AN ovulation test two weeks before my cycle started and it was positive for ovulation SO and I had sex that day and every day there after. AF showed up July 24th which is the day I usually have my regular cycles on prior to having my daughter. After my cycle went off after 4days SO and I had sex every other day. About 14days later I Took another ovulation test and it was positive. SO and I had sex that night, the next day and the day after. I still only breast feed maybe once or twice in the afternoon and maybe twice at night depending on if DD wakes in the mid of night. I have taken I believe 6-7 hpt and the first two I seen a dark test line and I extremely faint line beside it. But after that they all said negative. I am now 5days overdue on my cycle. Took a hpt yesterday and again negative. I don't know what to think. I'm super bloated, migrains, vivid dreams, loss of appetite and extreme fatigue. Could I possibly still be pregnant even though the text came back negative? Has this happened to anyone else? Please share your story. Thanks in advance.