On December 20th I had unprotected sex, and my fertile window started on the 23rd to the 29th. Last night I started what I thought was my period. Other apps I have said I was a few days late so I took a test and it was negative. Needless to say the bleeding hasn’t progressed much. There has only been a little bit of dark brown/red. The only time I saw red was this morning when I went to the bathroom there was a lot of blood, but not much else on my pad. I am really stressed, could this be affecting it, or should I retest in a few days?