How many weeks am I?

Rachael 🇬🇧 • 👶🏼✨ Baby Boy Born 17.01.19 💙🌈 💙
I'm really confused, I did a clear blue digital and it said 1-2 weeks but the date from last period is 5 weeks 5 days, I've booked to see my midwife in 3 weeks when ill be nearly 9 weeks but I'm just so confused everyone is saying that I'm 3-4 weeks but I don't understand as the week after I thought I ovulated we only had sex once, (I no it can only take one time) it's just strange... Any one? 

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