recieved this bra today it seems a little tighter than normal in the bust. My breasts are growing. Should I geta c cup or is this normal?

Depends on usage. Fit on this high impact bra should be snug and supportive (in order to keep the ladies in place during high intensity workouts like jumping or running) and shouldn't be worn all day. Low impact bras that are more elastic or have more spandex to accomodate a stretch are best for yoga or pilates and for some, can even replace a normal bra. I wear this bra for my HIIT workouts so it’s snug and supportive to reduce any sort of jiggle during jumps. As a 28D, I bought this in a 32 C for that purpose and its comfortable, snug in the breast area with no side spill. (Btw, the cups are not molded as the descriptuon says.) I keep mine hooked on the last setting and it fits perfectly for my workouts. If lowering the straps still doesnt make it comfortable for you I’d suggest going up a cup size.

My fiancé is 32ddd at Victoria’s Secret, and we know they have weird sizes. What size would she be with this bra?

The best way to determine the correct size your fiancé would need is to measure her band size and bust size.

How do you properly figure out your band size?

Well for me I didn't gain a ton of weight during my pregnancy so I went a size bigger. I used to wear 32DD so I got 34DDD and it fit perfect.

I am a 34h. what size would you recommend? should i size down since i want them to be tight while i do my workout? or should i get my actual size ?

I got 34c even though by measurement I should have gotten 34b. I need tons of support as I used to be double d and my boobs change monthly. The actual size is tight anyway. 34c is super tight in me. So I personally would not go down. But hope you get another opinion too.