Could it be implantation cramps?

Ria
Girls who have had your BFP and experienced Implantation cramping, can you help?? 
I experienced something new this month and now I'm on my tww I'm thinking back on my symptoms.
 I tentatively ovulated (didn't use OPK this month) between the 24-26th, ew cm and cramping through until the 27th. 
On the 29th I had the nastiest cramps I can remember having, so bad I was doubled over in pain, shaking and nauseous. It lasted about 15 minutes then was gone. No blood or anything in my cm though. 
Do you think this could be implantation cramps?!

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