Pregnancy Spotting

How do you know if you are bleeding because your period is coming on or if the bleeding is the sort some women lightly experience around the time their period would have come on when they are actually pregnant? I know the easy answer is take a pregnancy test - but before I can go out and get one I’d just like to know if anyone else experienced light bleeding when pregnant instead of their period. My period was due almost 1 week ago and the light bleeding has begun today. Advice welcome please - excluding people telling me to buy a home preg test - which I will do if necessary, just want more info in the spotting sometimes experienced at the beginning of pregnancy thanks!

i know alot of woman who spot their whole pregnancy and the doctors say its ok…. why do they have this and why is it ok?

I’m 6 weeks pregnant and have started having some light bleeding/spotting especially in the mornings. I’ve been scanned and as far they can tell everything is ok. I had a miscarriage a few months ago so know what to expect. I’ve also got endometriosis and was wondering does anyone know does this cause spotting or has anyone with endo had spotting in pregnancy?