spotting

I'm 6 weeks pregnant today. After going to the toilet last night and wiping I noticed some blood but not heaps and only when I wipe, I've monitored it all night and day and it went away but now after just having intercourse it's back, I'm not sure if I should be concerned or not? 
Baby at 5w4d scan was healthy and everything looked to be going well. 
I also have thrush, no pain in the abdomen or uterus. 
And I've been very dizzy to the point of fainting. 

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