Irregular periods

M00 • I`m happiest by the sea
Hi, I missed a period in July, then had one on 24th August. My fiance came home from being overseas on 7th September. We haven't been careful since. I've not had a period, yet but had symptoms. Cramps, painful breasts and nausea. I'm yet to take a test as, with being irregular, it might just not be on time. How long shall I wait?