Suggestion on dress for 4 months pregnant!

There is a good amount on Amazon you can purchase. Anyone I have seen pregnant has worn an Aline dress. Something that flows so you are comfortable.

Congratulations on your pregnancy!
Ballgowns and A-line dresses are going to be your safest silhouettes, since they are more forgiving in the tummy area and can accommodate a growing belly. A corset back (the ones that lace up) are also a really good idea, as they can be laced tighter or looser to fit you- which can save you money on alterations and also save your seamstress having to guess how big you will be by your wedding date. I would try to find something light weight as well. You’re already going to be carrying around a tiny person; you don’t need to be hauling around a heavy dress too!

Like cece previously stated ballgown and a line is your best bet but if you want to embrace the bump you can do a trumpet

Congratulations on your wedding and bub! Because you generally have to order the dress so far in advance, it's good to choose something that can be easily altered to fit however big you are at the time. My sister in law was about the same amount along as you are on her wedding day, and wore a beautiful wrap dress in a heavy crepe, like this Karen Willis Holmes dress:

View Quoted Comment Super cute! Was her bump showing or did it cover it more?

View Quoted Comment I bought a fit and flare before I knew we were pregnant but concerned how it may look pregnant. Any chance you’ve seen this style with a 4 month ish bump?

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It was showing, but was quite little, and the wrap portion kind of hid it a bit, plus she had her bouquet over it in some pictures (not that she was trying to hide it, just that it worked out that way). I couldn't find a picture of how small it was, most maternity wedding dress pictures were way bigger than she was at the time!

Honestly I don't think a 4 month bump will look too big - my mum told me she didn't start showing until about 6, so it mightn't be noticeable at all.