I guess I'm just posting for some reassurance?

I found out on Sunday I was pg, 4 wks 1 day to be exact. I did 2x pg tests which both came up positive. On Monday I went to my gp who also did a pg test, was positive and all my bloods (immunizations check etc + hcg) I also let him know that I had a light spotting that Monday... it was brown mucky discharge (small amounts) not bloody at all. The browny discharge stopped that night.
Tuesday was ok, partner and I had intercourse last night (tmi!) lol
Then this morning, everything was ok, til about 8am I went to the bathroom and when I wiped one streak of bright fresh blood came out. About the length of a palm... with a little clot. It's had me SUPER worried and stressed. There has been no more blood at all since that, all day, touch wood. I have had a very very slight heavy feeling in the bottom of my tummy... but no further blood.

I hope all is going well with my pregnancy. Some extra info is I got my hcg result back from Mondays blood test where I was about 4wks 2days pg... it was mid 400's. Is that normal?

Any opinions on what the streak of blood could be? My gp said not to worry... but he also gave me the whole talk on miscarriage's etc...