I felt that with my 1st baby. I was sat down (was 10dpo) and did a FR. I was having full on period pains and felt stupid for wasting my last £10 on a pregnancy test. I did it, and disgarded it feeling silly. Then picked it up and it was the darkest BFP i think Ive ever seen! I continued to have the pains for about a week or so, but it was fine my pregnancy was a breeze.
Good luck. x