Sounds so silly - sex, period, spotting, missed period.. could I be pregnant? BFN x2

Hi! Done two dip strips both negative. Getting store band/clearblue digital after work.

Anyone else had this and turned out to be pregnant?

19th July: sex

20th July: ovulation

21st July: sex

August 6th: period, 6 days (on time)

19th/20th August OR 20th/21st August: spotting. (Can't remember exactly but Deffiantly was two days)

5th September: expected period, still hasn't arrived. Tests negative.

Any advice welcome.

Thank you.