I think I've miscarried

Starting spotting on Tuesday been on and off ever since. Friday there was red blood in the morning went to hospital. Hcg came back at 90. Doctor said till early to scan as only 4 weeks 3 days. Booked early scan for 27th November. Yesterday had no bleeding till evening. When they was quite s bit of stringy red blood (think it was clots) and same today. So worried and scared. Feel it's over before it's begun. Been crying non stop.