I recently had a baby 3 months ago now Me

Patient: I recently had a baby 3 months ago now. Me and my partner had sex about a week after i gave birth. We tried to use condoms every time but had sex around 3 times without using one. I did come on my period and did do a test which came up negative. But we carried on having sex without protection. I then had a light period so thought i wasnt pregnant i then started the pill which ive been on for about a month now. But during this time ive had craving and adominal pain. Then last night i started bleeding and today its quite abit of blood which is dark in colour and my stomach and vagina have been in constant pain. I was just wondering as starting to worry myself if this could be a miscarriage?

Symptoms: Vaginal bleeding, adominal pain and vaginal pain

Doctor: