Idk what is wrong can anyone help❗️a lil tmi but need help...

Heaven

I just had a baby about 7 months ago And me and my partner have only had sex with condoms there was only one time that he did the “deed” into my vagina and I used a plan b but I haven’t had my period for 6 months the only time I did bleed was for a week after giving birth and then the month after but it was very light and only lasted 3 days. I’ve took three pregnancy test since then ,one which was two months without my period, the second was the third month without it and the third pregnancy test was 4 month in without my period all have been negative.... but the scary part is that I’ve been nauseas having headaches and heartburn and all my old pregnancy symptoms and it’s weird because sometimes I feel like I can feel something in my baby moving . I’m just brushing it off as I’m thinking to much and just imagining it but like I can’t be pregnant all test have been negative and I’ve been using protection and I just had a baby how could it be possible!!!! Not only that but I do breastfeed but I have since the beginning and my period still came even though it was a very light cycle and usually I have very a very flow and long cycle . Please any advice comment sorry for the tmi ;(