So, my last period was March 6th. My periods were pretty irregular, but recently have been pretty…

So, my last period was March 6th. My periods were pretty irregular, but recently have been pretty regular the past 4 ish months. Right after my period my husband and I decided to have another baby. around the 26th of March we started having unprotected sex, and we have every day since (I've been off birth control for almost 6 months already). but I think we just barely missed my fertile window but since my cycle is kinda whacked I'm not sure. It's now April 13th and I still haven't gotten my period. I took a pregnancy test yesterday and it was negative but I've been super nauseous and my boobs have been sore. When should I take a pregnancy test?! No signs that my period is coming and I'm freaking out excited..