i would take a pregnancy test if i were you just to be sure. as far as falling a lot i don't think falling is connected to pregnancy (from what i know). vertigo/dizziness can be a symptom of pregnancy per my friends. but i know there are other reasons why you can feel this way too - like an ear infection. so! i would not assume inconsistent period and falling down = pregnancy.
my period stopped after 2 days. lately i am very off balance falling alot. 2 weeks later i am spotting. pregnant?