Anyone experience one-sided cramps in pregnancy?

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Hi ladies! I'm 4 days late for AF which is usually very regular. Been ttc over 2 years now, so haven't tested yet as I'm scared of seeing another bfn & wanna give it a little more time. Been having some mild lower right side cramping though, which just this morning seems to have gotten a little more noticeable. I've been thinking that it probably means AF is on her way, but was wondering if anyone has ever experienced this (cramping on just one side) and still been pregnant? I guess I'm just trying to remain hopeful, but I think I might be doomed :-( Any feedback would be so appreciated! THANK YOU!!