Yes, probably is hormones. I recently had 2 periods in one month, didn't enjoy that lol. I've personally found that supplementing with iodine helps me be regular. I'd suggest you do some research about it, some people say you shouldn't take it on your own but I haven't had any serious bad effects, only positives. For more info you can check out Dr. Brownstein's site, Dr. Jorge Flechas, maybe underground wellness and mark's daily apple (they're probably more oriented toward eating or not eating certain foods).
I'm having similar problems, it's always best to mention any abnormal bleeding to your doctor. I've been bleeding practically every day since January, it's very annoying. Sometimes heavy sometimes hardly anything. Do go to yours docs. I'm sure it's just hormones but best to find out x
To add: was nauseated/ vomiting after bleeding began two days ago.