Could I be pregnant????

So i had sex on the 21st and 22nd. As well as on the 28th. I know it’s technically too soon to be “pregnant” when i just got off my period but I’ve been having VERY frequent urination. Pelvic discomfort. I’ve just been feeling uncomfortable lately and sometimes my nipples are sore. My boyfriend and I don’t use condoms (or pull out and yes we know the risks and don’t mind having a baby). I’ve also been tested for EVERYTHING (UTI, STD’s, etc.) including pregnancy but everything came back negative??? Can i be having these symptoms so soon n still be getting a negative result?