Hiya
it says online that they are a good sign but im afraid Ive had them a few times and turned out to be not pregnant
its the Progesterone in the 2nd half of our cycles that causes them I believe... but early preg symptoms are very similar to Progesterone related things so they can be easily confused
10DPO is still quite early to be testing tho so dont give up hope... just wait a few days and try again
Best of luck to you both

xx