I am day 10 of a 3 day embryo transfer & have had diarhea in the morning for 3 mornings now, my boobs have started to hurt today, I did a test first thing this morning - negative. Meds are 2 x 200mg ultrogestan twice a day & 2 x 2mg climaval 3 x a day, is the test reliable (first response early response) clinic test due in 4 days, last IVF I had positive result at 10 days, could I still be pregnant even though test said not?