21 days late and still no period

Kat

I'm kind of worried I've been in and out of the doctors in the last 7 days or so since my period had been 2 weeks late I've tooken a bllod testy and 3 regular hpt they've all came out negative my doctor says it might be my thyroid but our stress the problem is I'm not stressed at all my boyfriend and I habe been trying for awhile and I hope my health is good and just that due to me being pg don't know why I posted but I just wanted to get some insight on whay could be thank you in advance