Need Help!!!

Alright so my first time growing and everything is going great but about 2 weeks ago I noticed some brown spot on some of the bottom leaves and some turning yellow....Plants are in there flowing stage 2 weeks...Can some body tell me what to do.....these spots are spreding pretty fast

Hey,
You should give pics.

Yeah pics would be good. If youre flowering, are you still giving them nutes, if so what kind? and check the leaves for any bugs, especially on the underside. The yellowing isn't bad as long as it isn't happening too fast as flowering buds use a lot of nitrogen and this causes the leaves to yellow.