Currently 18dpo and AF is between 3 and 5 days late (my cycle length can vary slightly 27/31 roughly) From 15dpo when AF was about 2 days late I have had lower back ache and from 16dpo I have had these strange waves of my tummy feeling ‘off’, not sick but just not right and a watery mouth. Based on last AF if I was pregnant I would be 4 weeks 3 days but isn’t this too soon for backache and onset of sickness? Might test with fmu tomorrow but I’m just too scared of the disappointment of getting a BFN.