Faint?

Okay so calculating it I would be around 6 weeks (3weeks obstetrics) Ive had a period and was very heavy but suddenly this week Ive been wanting nothing but sugary things then feel sick as soon as I have any food and bloating and dont get me started on the tiredness! Just done a test very late and a faint line (darker than last) appeared within 2 mins so really confused! I also done a test around 3 weeks ago so will post then and now to compare but can someone tell me honestly what they think please?