How to respond to someone asking if you’re pregnant before 12 weeks

I have an acquaintance that knew I did

<a href="https://glowing.com/glow-fertility-program">IVF</a> last year, never told her the results. She asked me at the beginning of the year if I was expecting, I told her not yet. Her reply was “okay, I’ll ask in a month”. Obviously this seems a bit gutsy and insensitive. Not sure how to respond when she asks again. We aren’t planning to announce until I’m 15 weeks and on our babymoon. Any suggestions?