what should i do

i had an misscarrige 3 months ago i bleed for two weeks the third week i was off then i came back on for 6 days like a regular period. i haven't had a period since. i took a test a month later but one line was dark and the other was real light. so i take another 2weeks later and bothline was dark. i just took another trying to make sure and this one came out negative. what sure i do or think.