I got pregnant first time of trying, tested positive on the day I was due for my period. Had three bleeds during first trimester, getting progressively worse - the first one happened during the week, about week 5, and I was referred by my GP straight to hospital for a scan where they couldn't really see anything, so I went back a few days later and was fine. The second one, about week 8, was over a weekend so I referred myself into the same hospital dept 1st thing on Monday morning, where they told me I hadn't gone through the correct procdedure to be seen but scanned me anyway, and I was still fine. The third time I bled was a couple of days after a transatlantic flight, and on the cusp of my second trimester. I knew I was fine because my sense of smell and nausea changed so I flew back happy. Much of these bleeds were old blood, ie pink / brown mucus, although some were bright red fresh blood, and thin, unlike period blood.
It was only when I got back that my doctor said that it is very common to have small bleeds when you would otherwise be having your monthly period. Could this apply to you?
FWIW I also know someone who had a huge, heamorrage-type bleed at 18 (?) weeks, on her second pregnancy. And she was fine too.
So, please do not worry - difficult I know. But being tense will not help you, whereas getting lots of rest and TLC will. My advice is to have a bath and relax, try not to check on the bleeding every minute, although do keep an eye on any sudden changes in your discharge as information nfor GP / hospital. But I am sure you will be fine. Good luck with your pregnancy and don't hesitate to be bolshy to get the attention you want from your GP and hospital!