Late period

Hello lovely ladies. I have a wee question; my period is 2 days late. This is my 5th month TTC. Ever since we’ve been trying to conceive, my period has been crazy. Its been coming one or two days earlier than predicted, now its two days late.

I have no period symptoms whatsoever, apart from light backache, which is a bit unusual, as i usually have sore breasts, super hungry, and spot two days prior to period. Nothing this time!

I took a clearblue digital test this morning, with FMU, came back as not pregnant. Now, as i was rushing, i didnt read the instructions properly 🙄 so instead of holding the test in wee for 20seconds, i only did it for 10 seconds. Does that matter? Should i test instead with first response or wait till AF shows her ugly face? I honestly dont want to hope too much, but its so hard. I feel like my body and the universe are playing tricks on me 😢