Need advice

So today I went to see my gyn, expected period today but we found out last Sunday I was pregnant.... Soooo today at my Drs office he said when I tested it was a light positive meaning the test strip they take..... We took blood also has a sonogram we saw a something in a shape of a ball he said looks good so far. I go back next week for another sonogram n blood. No history of miscarriage for me but I'm worried he said it was a light positive these r my tests I've taken at home in order , to me they r getting darker .