TTC / late Period


So I’ve been trying to get pregnant forever now, my doctor put me on metaformin 500mg. I’ve been taking it since August of this year. Well this month I’m 6 days late, I’ve been regular on my periods this whole year. My breast are sore and they get worse at night. I haven’t taken a pregnancy test because I don’t want to be disappointed 😔. Should I wait another week?