Uy, normal yan na normal sa first trimester, especially around weeks 5-7 kaya huwag mag-alala! Ang feeling na parang flu-like symptoms, cramps, dizziness, at walang gana, lahat yan pwedeng kasama ng pregnancy changes, hindi lang strictly "morning sickness" kundi overall adjustment ng katawan mo sa hormones. Pero since may lower back pain ka at cramps pa, mas better na i-check mo agad with your OB just to be safe, lalo na para ma-rule out kung okay lang ang pregnancy at sa tamang lugar siya, kaya pls don't delay na. A few of us mums nag-experience ng ganyan early on tapos totally fine naman, pero better peace of mind talaga kapag medically cleared na.