Hi Missmars, congrats on your BFP.
Every pregnancy is truly different & what happens in one may not happen in the next. Bleeding can happen during pregnancy (some women continue having periods until they give birth) for various reasons (stretching muscles/sensitive cervix/low placenta/implantation bleeds) without meaning bad news. As long as you aren't doubled over with abdomanal pain you're likely ok. What you've discribed will likely be an implantation bleed & perfectly normal (my 2nd pregnancy I bled for the 1st 15wks). Don't be afraid to ask questions when you see your MW (you won't be the first nor the last, even if your questions seem daft or obvious).
It is both scary & exciting carrying your 1st child with nobody truly able to tell you what to expect other than a growing bump ending with a new baby, the rest is truly your own individual journey. Enjoy a happy, healthy 9mths.