my last period was on july 29, on august 20 i have spotting along with frequent urination for 3 days, the spotting stops for 2 days then i have heavy bleeding on august 24 @ 12nn,after 31 (august 25 @ 7pm) hours i have stomach and backache so painful that i almost collapsed..after i take mefenamic acid, my bleeding stops for 1 day,my daily chores continue when i lift up a heavy thing i started to bleed again (august 26 @5pm). its been 5 days my bleeding now was on and off..could it be a signs of pregnancy? please help, im so confused.