Brown spots... is it really calcium deficiency?

Sooooo i got myself some nice Bubblegum ladies :weed: for my balcony. Weird fact: Although the plants are quite young, they started blooming due to lack of daylight on my balcony (I know, I know... amateure. You guessed it, I'm a noob grower).

Anyways, it is now week 6 or so since I got my plants outside, and since the last 2 weeks, some weird brown spots started to appear:confused:. I read something about it being related to calcium deficiency, but I dont know exactly tbh.

My question is: is it really a calcium deficiency or something else?
IF it is related to calcium, WHAT should I do? :-(

My plants are planted in regular flower soil, pre-fertilized for 8 weeks.

Any advice is strongly appreciated!

Keep it up :):eyesmoke:
 

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