Nervous need help...

Wanda • I am a 28 year old mom of 3 children! My boyfriend and I are expecting our last baby in February 2017! between is this will be our 6th and are very excited!!
So by my LMP I should be 6w1d pregnant... ended up in er with cramping and some bleeding... they did ultrasound and it showed sac and when measured it was 5w3d and had a yolk sac.... I just had a miscarriage in February and am very nervous.... what does everyone think?