Negatives before missed period ?

Hi guys, my last period began 26th December lasted 5 days, My cycle is every 23-24 days, I do keep track of this.. I had intercourse on 3rd and 4th January ovulation was 5th, the past week I have had mild cramping, headaches and serious hot flushes at night, let’s not forget the insomnia I’m having all this week Iv not been able to get to sleep till at least 5/6AM.

I took a test on Tuesday this week and it was negative was just a Morrison’s own. I then tested again on Thursday and negative again, I am due my period today 18th January. Can anyone give me advice if they have had negative tests before a missed period then tested positive?

I have been pregnant before and I remember having bad insomnia 🤦🏽‍♀️