Its such a worry, I can understand how you feel. Hope you managed to get seen or some reassurance from the EPU today.
It might put your mind at rest but I had spotting in tri 1 and have had two heavy bleeds in tri 2, one lasted 10 days. I had a scan during the first heavy bleed and everything was fine and they think it was down to a burst blood vessel in my cervix, which is likely to bleed again if aggriavated. Hopefully a scan will show you that your LO is ok and that your cervix is closed and then you can relax a little.
Good luck, fx for you
xx