is my body tricking me?

so ive been ttc since the last period i got after my MC. i ended up bleeding on cycle day 27 when im normally a 31 cycle. it was Much much lighter than normal but was still a bright red. ive heard implantaion could be multiple colors but idk..ive taken 3 tests since the bleeding stopped which was on feb 23rd and they were all neg. i normally cramp and have backache the day f my period, well i had those at 12 days till i was due and then thr bleeding so i really thought it could be implantaion. well i feel like my boobs are heavier and my nipples started to hurt yesterday and my areolas are larger. when i was at the hospital for my MC my levels were at 17. idk what my levels were prior cause i only found out 2 days before it. im wondering if its possible to still be pregnant but my hormone levels are rising so slow that they arnt picking up on the tests or do i want a baby so bad that my mind is making my body play tricks on me and making me think im pregnant and experiencing these things when im really not. anyone have advice or a similar story?