Guppys starting to behave very odd

[smyth19]

I have three female guppys in my tank, and three of them are pregnate!! one has a very black stomach but is not that fat, the second is very fat but isnt that black(just a bit of black in its belly) and the third not that fair along. But anywayz to the point they have been actting strange today just flooting about the filter and i was wondering if they is there ready to have babies or just in need to chill out??
Any suggestions!! which would be must helpful

Thanx Alot, joe!!!

 

[Kossy]

Have you noticed them being slightly more aggressive. If you have then hopefully not much longer....

 

[Phase2]

I got 2 lady guppys in the same state and 1 of them is hanging around the filter too??....I'm not sure why....I think they was preg last month but I must have missed the birth as I got no fry...I'm gonna put one of them into a floating breeder tonight to see what happens

 

[infant340]

i had the exact same prob the 2 guppies would just swim next to each othe ude the filter thigny