Before I knew I was pregnant , I was 14 days late, lol but the cramps made me think my period was coming and I was just stressed so I figured that was delaying it. Cramps are normal, to a point but there is never any harm in seeing a doctor for it, your pregnant your allowed to be ocd about anything that involves your little one!
I'm only 17 wks , but I still get twinges here and there , and everytime no matter how big or small the pain is I get a little nervous, nothing wrong with that.
If your just doing at home tests get to the doc, it's always reassuring to hear it from them.
Good luck and happy pregnancy