When can I test?

I miscarried a month ago and I stopped bleeding a week ago I’m starting to have pregnancy symptoms again (we are using the pull out method and of course we want a kid we just wanna mentally heal first but it’s ok if I do get pregnant) I took a test yesterday and I tested negative on a blue dye. When should I test? I don’t even know when I’m supposed to get my period due to me miscarrying