Last period November 30.. Negative test

Kat • Pregnant with baby #3
Don't know what is going on with me.. I have taken so many hpts and they are all negative! So many pregnancy symptoms or maybe pms but nothing!! Boobs are sore, lower back aches, headaches, mild cramps, bloating/gas, food aversions, nausea.. The list goes on. Could this be pcos?? Stress?? What's going on? I'm starting to worry.. Anyone else have this issue? Help!!