14 days late period pregnancy test negative

My periods are always on time I am now 15 days late and my pregnancy tests are - I don’t have any symptoms and with my other kids I was sick so much before my period was due and before that prego test turned + I knew with them as soon as I was 1 day late I tested and was + now this is 15 days and it’s still - I’m getting so much anxiety . I am not on birth control my doctor didn’t want me on it for one year cause of my hormones . I used the pull out method when we do the deed and I know we didn’t pull out late