Period date late and BFN

Mary • Married 💍 6/27/14 ~ Annabella 👧🏼 9/12/15 ~ Marybella 👧🏼 6/28/19

Took a test and it’s a BFN why is conceiving baby number 2 so hard ? And now maybe my period is falling off track. I have a 2.5 year old and my husband and I want a second one... I tested I ovulate, so now we are going to have my husband take a sperm test to be on the safe side. But do u guys know any way to conceive quicker??