Try to relax and take it easy, sweetie. I know how nerve-wracking it is to bleed during pregnancy... I didn't realise I was pg with DD1 until I was nearly 10 weeks because I kept having what I thought was my period, I continued having little bleeds on and off until about 26 weeks and she was born perfectly healthy at term. DD2, I knew I was pg before my period was even due, so when I got the spotting I freaked out a bit but told myself it was just the same as with DD1, and I was right - I only had two 'periods' and then didn't bleed again until after she was born, but I know how you must be feeling right now, especially it being your first bub.
Go and see your doctor as soon as you can tomorrow, try and take it easy tonight and see how you go - please keep up posted, I'll be thinking of you and the little bundle you got in there