Pregnant Corydoras?

I have a 29 gallon tank, 1 honey gourami, 6 harlequin rasboras, 5 flame tail tetra, 4 green neon tetra, and 1 panda corydora.( before you ask originally had 6 Cory’s about a year ago but with in a week 4 died and when I bought three more they died as well so I stopped trying to keep them and my other one died about a month ago). I have a heater and filter and water is at 72. Last water change was a week ago and I do water changes about every 2-3 weeks. I don’t have any test strips because I ran out the other day and I bought some on Amazon so I don’t know what the tank is like but the last time I checked about 4 days ago everything was fine but had little bit of a high nitrate. They are feed fish flakes, bottom feeder pellets, and frozen brine shrimp or blood worms every Friday.

My panda Cory has a gray looking mass on its stomach that I noticed when feeding today. Sorry about the photos looking not that good but my Cory doesn’t like to stay still. She likes to glass surf so I have seen her belly a lot and only noticed it today. I have never had a pregnant fish before so I’m not she if it’s eggs or a mass. I’ll try to get some better photos and upload

I do understand that Cory’s are egg layers and if she does have eggs they are not fertile

 

Think you're looking at the breast skute (but hard to see)

 

Looks like the white dot on all my corys bellys

 

I took some better photos it’s right below its head.

Looks like the white dot on all my corys bellys

It’s more of a bump then it is a dot

 

It’s more of a bump then it is a dot

I know, I thought it was carrying eggs too then I realized all 6 corys had exactly the same bump.

 

I know, I thought it was carrying eggs too then I realized all 6 corys had exactly the same bump.

Ok I just never seen it on her before so I got scared