There have been several other threads on this topic (you can run a search to find them if you want quick answers) but the gist seems to be that it depends.

Me personally, I've noticed no change whatsoever with mine, but that's just me.

Other folks have had massive increases in flow and sometimes (not always!) other issues (like anemia) that come along with it. I know one or two of the gals have wound up in the hospital due to blood loss and/or anemia, but you don't seem to be headed that direction.

What did your doc suggest for the light-headedness and dealing with all this?

I don't think warfarin is the culprit for me. My periods were heavier only because I had to stop taking the pill.

TossNturn unfortunately my dr hasn't said much aside from if it worsens then go into the er. At this point I'm drinking as much water and juice that I can to keep my electrolytes up "just incase". I asked for an iron blood work up so will be doing it tomorrow when I go to check my inr.
I will do a search of the boards for more insight thank you :)

My periods tend to be heavier while on coumadin. But the thing I'm thinking of in your case is that since you're postpartum, it's a combination of the two things. My first one after each baby was understandably heavy. But my periods while on coumadin for the first year postpartum for me were quite literally nightmarish. You won't know for sure whether that's true of you or not until you've had more, because some women seem to not be much affected that way by coumadin. So please don't just jump to the conclusion that every time will be like this one - it may very well not be. Mine were bad enough though that it was actually depressing to me, I couldn't stray far from the bathroom and they lasted a couple of days longer than when I wasn't on coumadin (that's still true for me when I am on coumadin, but the bleeding isn't as bad for me now as it was initially), also it usually took me almost another week to recover any level of energy afterward. I think at the rate you're suggesting bleeding it doesn't sound like enough to be panic level bleeding, and a lot of women on coumadin get more than average clotting, so don't be scared by that either unless you see something really out of the ordinary. If your periods continue to be quite heavy for months and months, you may want to let your doctor know just to check and make sure you don't get anemic. But again, try not to worry unless you see this being a pattern for you. But I had to be on coumadin in the year postpartum, then again another year later, and there was a difference with the first time causing much worse bleeding. I hope that won't be the case for you, but talk to your doctor about it if it is. My doctor ultimately cut my coumadin treatment short by about three months because I was so miserable, so just work with your doctor if there seems to be a problem.

I have been told to expect my already heavy periods to be heavier on warfarin, so my gyno is inserting a Merena IUD soon to try to alleviate that.

mines were heavier - you could notice thinner - and in the early months i was glad to be at home rather than having to be in work - its not nice but as the months went on it did seem to lessen slightly - or maybe i just got used to it! I did have a few clots the first month but not after that.

Mine are really heavy and I do passed clots as well. My Dr & Gyn doctor both say that it can happen while on Warfarin. I'm now taking iron infusions because i'm anemic. Definitely check with your doctor if you're feeling light headed.

On the up side, once you've made the adjustments needed with your doctor its less scary :-)

I totally freaked out when I started taking warfarin because I have had super heavy periods that were controlled by bc pills for years. My PE was likely caused by the surgery I had to remove a large fibroid, so thankfully my periods have actually been much lighter since I've been on warfarin. My doc told me (during my freak-out) that if I was soaking an overnight pad in an hour for more than 3 consecutive hours I should go to the ER, otherwise I should just take my iron pills and call the on-call doc if I was concerned.

Jenner that's the same as I had been told also, thanks for bringing that up because it helps to have some guage of what level needs immediate treatment and what we just need to keep an eye on.