8dpo should I test??

Nia
I'm not 100% sure which day I ovulated last week but the most I could be is 8dpo. Have been ttc for 8 months and never had these symptoms until now:
-The day after my fertile window ended I came down with a cold (I've read this is a good sign as its your immune system lowering??). 
-I usually have very bad pre-pmt mood swings on cycle day 19 (I think due to estrogen dipping after ovulation) but nothing happened this month. 
-I had literally one dot of blood when I wiped on around 5dpo (sorry tmi). Earlier that day I'd felt some faint twinges in the centre of my abdomen. 
-I had very mild backache yesterday (like the start of a period). 
- Today I can feel a dull crampy feeling/tenderness in my abdomen. I'm definitely not imagining this and it's never happened at this point before.  
My period is about a week away but I'm dying to test now. What do you think?

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