please try not to fret, altho easier said than done I know!
I had a car accident when 28wks pregnant with my DS1 (he is now almost 10!, where did that time go), and up until delivery (at 35wks), I was very strong painkillers, anti-inflammitories (part of the neurofen family but I had stronger) plus other drugs due to me breaking my ribs, severe whiplash, other muscles injuries, plus they also had to stop prem labour as it triggered labour.
he was fine, and ultimatly so was I, and the medical profession gave it, and if they can (altho it was under supervision in hospital amd fully monitored), then 6 over the course of 2wks isn;t going to be of major concern, and if it was going to trigger anything I think it would have by now.
of course tho, I am not medically trained in any way, only speaking from my own experience, and in cases such as yours, you are only really and truly going to be reassured by some one who is medical. My honest suggestion would be to try and calm for now, but maybe ring your midwife in the morning with a veiw to maybe getting baby checked or monnitored......it will put your mind at rest as much as it is going to until your are holding your baby in your arms.