Can you feel it when you conceive?

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My friend had unprotected sex and he finished inside of her. She also missed a day / few days of her pill. She had spotting this morning which is strange because she doesn't get her peroid on the pill. She talked to her mother who said not to worry because you feel it when you conceive? I've never heard of this before. She's not taking any further action because she said that to her. Can anyone clarify