bicornuate uterus and problems, Should I take a test?

Hi I am 21 years old and I have a bicornuate uterus. I found this out when i was 15 and i was getting two periods a month, so they sent me to get and ultrasound. Well for the past 10 months my husband and i have been trying to get pregnant but no luck. I have been late up to a week and half but had full blown periods that lasted about 5 to 7 days  when they came. well this month I was 5 days late and had an extremely light period that  only lasted 3 days. Normally the bloating look goes away after my period and it hasnt, i feel sick through out the day it just comes on suddenly. I am also experencing cramp throughout my lower adominal (abdominal). I am now what would be 2 and half weeks after when my period was to come. I was wondering if i should take a test or if anyone else has had this problem.