I 1st tested on sat 03/05 when AF was due with an internet cheapie dipstick and got a very, very, very faint double checked with a clearblue non digi and that said I went out and bought a pack of 2 clearblue digis and tested again on tues 06/05 with dipstick test and got double checked with a digi and that said pregnant. Had to test again on the wed morning infront of DH so he would actually belive it was true!!! Think I was 18DPO when I got the digi Sounds like she wants to steal your thunder. How rude!!!!

I was 7DPO when I got my first positive (it wasn't a blazing one, just a little faint line) but yeah, it sounds to me like if your SIL had not gotten pregnant, she would have "miscarried". I hate people like that