Really scared

Okay, so recently I've had a really bad cold, I was taking 4 of the 1000mg vitamin C tablets per day for about 3-4 days. Well I've just found out I'm 7 weeks pregnant and I've read online that high doses of vitamin C can cause a miscarriage. I'm so scared that I've done something to harm my baby, I can't stop crying, this is all I've wanted for so long and now I could have ruined it all. Has anyone done anything like this or has any advice?