Advise

Hey lady's so I'm really nervous and I need help if anyone can help me please let me know? So I had sex 3 weeks ago and i useally start bleeding the day before I'm supposed to get my period tomorrow and nothing? Could I be pregnant again? I had my baby 2 years ago and I know I'm stupid for not being on anything but everything I tried made me sick please don't judge me or no drama I just need some advice please