You still have between 5-7 weeks left. The will get a lot bigger. You are at the stage now where they are going to want more bloom nutes and a lot less N.
dude, don't stress out! buds will grow bigger. it's only the 3rd week of flowering wtf?! they have another 3-5 weeks to go, plenty of time to swell up and put on weight like a child eating junk food and getting a large under-chin belly and diabetes
Hey Growmie,
No, the buds aren't tiny just not developed yet, your only 3 weeks into flower so yes, they will fatten up as the weeks go by. Hopefully, I answered your question and remember Happy Growing and Free your mind one puff at a time.