i wouldn’t worry i had the same thing i had brown spotting on and off from about week 5 to week 10
a couple of days it was even bright red
i am now 35 weeks pregnant and going strong
apparently its normal to have spotting around this time.
i had repeated ultrasounds about 1 every couple of weeks and they could never find out where the blood was coming from.
just take it easy and don’t lift anything to heavy.
and if you really start to panic go to your gp and ask for a referral to get an ultrasound.

good luck