Okay guys !! I need advice!!!!!

So me and my boyfriend have been having unprotected sex the past three months . I’m not on any form of birthcontrol and we aren’t trying to have a child but we aren’t completely against it . So on the 11th I found out that my boyfriend gave me an STD and took the medicine for it from the 12th until the 18th . So my period was supposed to start on the 15th and it’s not the 22nd and I still have no sign of my period. I took a test on the 19th that read negative so I’m not sure what’s going on. Could it be the medicine throwing my period a week off or could I be pregnant !?!? 😭😭 Helppp 🤦🏾‍♀️