Spotting

Hi guys so I'm early probably about 5 weeks, Betas 30 then 71, went again this morning, but I have had brown spotting and yest it was a little dark red with some cramps and tissue for about 5 minutes then nothing since, just back to some brown spotting when I wipe, not filling up liners!!
 They said it could be uterus stretching I'm so scared though, today I truly feel pregnant, lower Braxton Hicks etx
Anyone have spotting like this and go on to a healthy pregnancy???