I had same issue at 8weeks too, mine even came with cramps I was scared to death cos I had a miscarriage at exactly 8weeks early last year rushed to the hospital a scan was ran and baby heart was beating perfectly am now 10weeks and everything is ok.......they said its normal womb just stretching. So go to the hospital to put your mind at rest am sure baby is just getting bigger. Kisses
Registered Midwife