Is Pregnancy Possible Despite Negative Pregnancy Test Results?

Hello doc, I have an unprotectedsx with my bf last december 25 he pulled it out. Before my period came on jan 11 i have experienced bloating back pain and cramps anywhere in my stomach. I even have pharyngitis that time. My period lasted 4 days. And i have pink spots after that and it lasted for 2 days. Days after i experience thick vaginal discharge that is clear and does have some little whites on it for 9 days. As i noticed, it drops everytime I pee. Im thinking it is a side effect of the antibiotic amd i habe an itch on my genital sometimes that time. And now my second period came in feb 12-15. I have my cramps on my first day jush like what ive experienced everytime im having my period. Then after that i noticed pink to yellow spots when i wipe. And then now i feel something inmy stomach like theres pressure. Im not craving. Im not frequently urinating. I dont have fatigue and breastpains. I am just bothered if i might be pregnant because I am so conscious with my tummy. And my pulse is fast. I can even feel my blood flowing on my toes and fingers and lastly. I have this pulse like my heartbeat above my bellybutton as well as on my pubic sides. It is very visible. I ve taken 3 pregnancy test and it all came back negative. Im really stress for 2 months. Crying everynight. Im sorry if this take long already. Im just hoping for an answer. I don t want to be pregnant yet. Im thinking if this is all cause of my stress and panic attack for 2 months already. im skinny. 5 and 19 years old. Thank you.