Thankyou so much, is it normal for her belly to get ridged during her pregnancy?

I had a possible ovulation date of Dec 11. With this when would she be due to drop?

Here are her weights since January 5. Jan 5 - 3087gms, Feb 4 - 3341gms, Mar 2 - 3548gms, and Apr 1 - 3617 gms.