really weird symptoms..

Alicia • Wife trying to live life with my husband and my baby boy

So I've been off birth control for 5 months now going on 6 next month. Well in that time my husband and I have been trying for another baby. Well the month of November and this month. I have not had a period. I've had severe heartburn with ANYTHING I've eaten and been frequently running to the bathroom. And my smell has changed and things are starting to taste different yet when I take a test it's a hard negative. I took clear blue digital I've taken the line test and all have come up negative.. what do I do? and hubby is in the navy and I have 1 more year before he's off to a fleet so we are kinda trying before he leaves.