10dpo and horrible cramps

So I stupidly tested this morning at 10dpo and as I thought got a negative. I have cramps, backache and sickly feeling every now and then. I cannot tell if this is the start of my period or could be the lead up to a positive test (symptoms are the same right!?) I know I tested early (though i did use FRER) do you think I should wait until Monday when I'm 12dpo and then if needed Wednesday which would be my missed period at 14dpo (though I am recently off the pill so going by the date given by the app, I tested ovulation with OPK for my positive), I should have left it until Monday like I was originally going to.

Please give me some hope xx