I think deep down you know, with DD i couldn't remember when last period had been but i was 100% sure i was late, i told DP and he was like no your not don't be silly, we did a test and couldn't see a thing.. 3 days later and i had been DREAMING i was PG and i did another test and now here she is.
I didn't have sore (.)(.) or feel sick i just knew, i was always so hopeless and knowing about my period.

With DD#2 - Due in Jan i started dreaming about it and as my cycles had been irregular since DD1 i had again no idea when i was due.. started not getting any sleep and told DP i really need to do a test before i go NUTS and low and behold another one on the way...
I cried for a bit as it wasn't part of the major plan as DD is only 10mths old now and will only be 15mths when #2 gets here... but it happens.

Sorry for babbling, i just think your body often knows things the brain wont automatically tell you!
Hope all goes well and you find out and put your mind at rest soon.