Why do I suddenly take dry?

The other day me and my boyfriend be having sex and roughly speaking 10 or 15 minutes into it felt similar to he was going soft [The notion like he keep slipping out and its hard for him to walk back in] but when I reach down to feel him.that be not the problem. I was really dry.it be so bad that we have to stop because it was making me sore. I own never had to use lube, usually Im severely wet during foreplay and adjectives through sex.. the only article that is different is I started the Nuva Ring in the region of a week and a half ago, could this be cause my problem? Does anyone else have one and the same problem?
Any info/experience would help. Thanks.
Answers:

Are my breasts the right size for my age?

ya it can be the nuva ring. i own heard explicitly a side effect. go gossip to your doctor if you want but a friend of mine had that problem too

Any of you ladies used a unconscious progeterone cream?

sometimes , birth control products to course to effect to get dry

Is spotting brown-pinkish period/discharge a sign of pregnancy or is this normal?

use KY or Astrolube - it's other better that way (after oral of course)