Possible sign of conception?

So I am 6 days till my next cycle, but for the last two days I have been having pinching almost cramp like feeling in my lower abdomen, right at pelvic area. My cervix feels low and very firm. And sex was a little uncomfortable. I dont want to get my hopes high or mentally physic myself with pregnancy. But this is an unusual feeling. I have heard some women feel a slight pain when the embryo attaches... is this possible sogn of conception? We have used glow and ovulation tests to help this month to get pregnant too. Any ideas or info is much appreciated.