Is it normal to bleed while pregnant...?

La

So about a 2-3 weeks after I found out I was pregnant I bled, it seemed and felt like just period.. i thought I was miscarrying (I always think the worst..😒) I went to the hospital they did a pregnancy test and said it was negative!😞 I just thought I miscarried. then a couple of months or so later I didn’t bleed at all and now I’ve started bleeding again!! I’m getting bigger and i’ve got a dark ish line a bit darker than my skin going from where the top of my pubic bone is to the bottom of my belly button my belly is rock solid too I’ve still got all the symptoms! I feel sick & been sick a few times I have all the symptoms I’m so worried and so confused😣 anyone else had this? Any advice will be helpful!!!