urination headaches and emotional

hi people i could do with some of your help please i had a miscarrige in march n ever since my periods have been funnylast month i was 3 days late which is very unusual so i done 4 test but they came back negative, since then i have needed to urinate on a more regular basis n also wake in the night for the toilet which is unlike me , other than that i have been getting very emotional and just start cry over nothing atall and go in silly little moods with my partner who has done nothing wrong , i am getting frequent headaches also n also very lathargic do you think i could be pregnant and its worth doing another test please help x thanx lippy x 8-|