Missed period

Ok so I’m only a day late for my period but my periods are ALWAYS on time , I’m never late and sometimes I even start the day before the app says I should, but I’ve been having literally ALL the symptoms of pregnancy but I took a test on 11 dpo, 12 dpo, and the day of when my period was suppose to start and they were all negative. could I still be pregnant or what should I do? I’ve been ttc for about 5-6 months now so I’m trying to be hopefully but I’m having a really hard time with this.