This sucks, I think if you used the genuine URL you will be OK. My concern is that you sent your BTC to a phishing URL (please say it was the genuine website).
That's not enough, if you use non onion websites on Tor, many exit nodes try to steal your Bitcoin:
They (selectively) remove HTTP-to-HTTPS redirects to gain full access to plain unencrypted HTTP traffic without causing TLS certificate warnings.
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It appears that they are primarily after cryptocurrency related websites — namely multiple bitcoin mixer services. They replaced bitcoin addresses in HTTP traffic to redirect transactions to their wallets instead of the user provided bitcoin address.