Ideal timing for maternity photos

Carolyn • 1st time 🤰 & waited so long for our little blessing. Can't believe this roller coaster of emotions of 1st time moms. 😁
Hi ladies, I'm still on my first trimester but since I'm a first time mom, I got a little too excited and was looking for maternity photography services earlier. The one I was eyeing only had a validity of 4 months upon purchase which means I would only be on my 28th week by then.
When is the best week or timing for the photo shoot? At 10 weeks today and I already have a slight bump.