HELP late period


I am now 6-7 days late on my period. Me and my partner uses a condom and he pulls out with the condom before he enjaculates. But I have taken 2 pregnancy test and both have came back negative. Took one 2 days late and the next one was 6 days late. I have been a little stressed, but now I’m getting a sore throat, stuffy noise, sinus issues. Can someone tell me what’s going on? Thanks!!!