10 days late, neg hpt, help!

Marie • IVF # 1 👰🏻🤵🏼Expecting Twins Nov ‘18
I'm usually very regular, but I am 10 days late. Af was expected on Dec 20th, on the 24th I experienced ewcm and have had negative tests since the 20th. I am at odds since new to ttc, any advice?