Someone please tell me I’m not pregnant

Alright so my period was supposed to start on the 9th and i had PROTECTED sex on January 25th. I told my boyfriend and he started getting all paranoid which got me thinking about it so on the 12th i took a pregnancy test which came out negative and on the 13th i took another test and it also came out negative. The problem is i still haven’t started my period and I’m 4 days late is it possible that I’m overthinking it and stressing myself out or should i be concerned?