Heavy cramps 4 weeks

This is my third pregnancy (2 losses) and I’m 14dpo today, 4 weeks, super dark lines on my tests but tonight my cramps are so bad! My period is due tomorrow and the cramps have been really sore. My lower stomach and my back, aching. The mild cramps are always there but every so often I get this sudden wave of sharp painful cramps take over my body I have to breathe through the pain. Has anyone had this and been ok? I’m so worried because of my previous losses.