I Saw Cream Spotting On The Day I Was Supposed

I saw cream spotting on the day i was supposed to have my period and had a urine pregnacy test the next day and i tested positive. Two days later the cream discharge turned into blood and i rushed to the hospital on the 22nd December. Iv been admitted for 2 weeks and am being given prontogest injection and some multi vitamins everyday, the colour of the blood changed to cream again as soon as i was given the injection. The doctor also prescribed cyclogest for me but the nurse says i can only use it when the spotting stops. But just this morning iv seen blood again and am feeling some slight abdominal cramps. Am sooo worried. I had a micarriage 4 months ago and am afraid the same thing will happen again. Please advice.