Differences in estimated size between pregnancy apps

I have downloaded A LOT of different pregnancy tracking apps since I found out that we are expecting our first baby. I really enjoy seeing the estimated size and updates on our baby bean. That being said, I've found it interesting how the different apps can't agree on a size or shape for how far along I am (5 weeks 2 days) so I decided to screenshot the different apps to compare them here just for fun.

^^^Ovia pregnancy. Baby is the size of a lavender bud. Looks like a tadpole.

^^^ What To Expect- pregnancy app. Baby is the size of a fly. Looks pre-tadpole.

^^^ The Bump. Baby is the size of both a lentil and an apple seed depending on where you look on the app. Looks like an alien tadpole.

^^^pregnancy+. In a different part of the app it says baby is the size of a lady bug or a piece of rice (both of which are pretty different sizes...) Looks pre-tadpole

^^^nurture (which is Glow's pregnancy app.) Baby is the size of a chocolate chip. Looks like a tadpole.

I know estimating the size of something that is as small as a 5 week old embryo is really difficult so no shade to the apps, again I just thought it was interesting and fun to compare them all in one place. 💕