Is My Female Sp 44 Holding?

I've had my sp 44's for around a month (2 male 2 female) They are only around 2" and I haven't seen any breeding activity, however, I have noticed over the past few days that one of my females hasn't been eating and she isolates herself from the rest of the tank. She also has a small lump underneath her throat, could she be holding eggs? if so how long before they hatch and she spits them because I need to know whether to strip her or not.
 
Heres a couple of pics if this helps
 
 

from the pictures, id be more inclined to say no, sorry!
I could be wrong though and its been more than 3 weeks which i think is the average holding time....so.....
was she holding?