Is it still possible to become pregnant during AF?

i was a normal 28 days, then it went weird and was 32 now it seems i am now a 26 day gal, now my af lasts longer too, so it used to be about 7 days but i find it lasting about 11days (most of it just spotting) but when i do the calculations for ovulation they say im ovulating while i'm on. so is this true? also isnt it quite hostile while you are on AF for sperm? is it still possible to get pregnant?