I felt really off for about a week maybe a little longer and then suddenly all of this symptoms went away and I thought I was losing my mind!! Haha I tested very early (twice haha) and they were both negative! And the morning before my period was supposed to be due (according to my pill cycle) and I woke up and I was just feeling a little off again and I thought "oh what the hell I'll just do the last test!" And it came up positive! I nearly fell off the toilet!
I had convinced myself I was pregnant but then when the symptoms went away I convinced myself I wasn't!
It was really confusing..

I was in the same boat as you as well.. Me and DF weren't aching for a baby but wanting to start trying, and hey presto- bun in the oven!

Good luck!
Please let me know how you go..

Just wait until your period is due, or the day before..