should I tell my mom we're TTC?

So my husband and I started trying in August and we haven't gotten pregnant yet. The original plan was to keep it a secret and surprise everyone once we got pregnant. But my mom has recently been mentioning pregnancy a lot, basically begging us to have a kid. It's started to become exhausting lying to her. Also, with each negative pregnancy test it becomes more uncomfortable and sad when she keeps asking me when we're going to have kids. I'm thinking of telling her so that she will simmer down and also because we are best friends and it would help me to be able to talk to her. What do you think?