Baby moving!!

I'm 17w 4D and last night I was laying in bed with DH watching TV... I was feeling the baby move. It was more aggressive then what I've been feeling for the last 2 weeks, so I told DH to put his hand on my belly to see if he could feel it. Just then he felt a THUD. It was light but he felt it! Then 3 more to seal the deal!! I'm thinking it was the head or rump because of how big it was for baby being so small!! With my first I wasn't able to feel movement from the outside till about 21w!! We got lucky!