I was supposed to start AF on Friday and was out of town all weekend , just thought I was late ... 15 dpo and got these last night. Couldn’t believe it hence why I took 5 lol. Now I am over analyzing everything and worrying that it could be chemical. Any thoughts or experiences ? Just don’t want to get my hopes up and then not have it stick! Also, you figure how far along based off of first day of last period right? That was 3/21 , 33 day cycle or so , so almost five weeks ?