When’s too early to take a pregnancy test?

I was recently due to have my period on the 25th of December, but eventually ended up not having any sign of bleeding or even cramping. I’m quite curious whether or not it is too early to take a pregnancy test or wait alittle bit longer, this is the 7th day of a missed period btw. So far I haven’t had any bleeding, the only symptoms I’ve been having are sore nipples which started to bother me yesterday, minor tummy aches which happen early in the morning and late at night before going to bed.