Hi! So I'm 16dpo today and 2 days late for period. Did the deed on ovulation day and have done a few tests as been extremely tired etc. Bfns. I have 2 children 13 and 2. Took a clear blue this morning dipped it checked it didn't see second line so left it. Came back upstairs after half hour and there's a line. Now It could have well appeared in the time limit it may not have what do you think?