Just thought I'd update this post for anyone who finds it with a similar question. My period came back at 8 1/2 months! LO still feeds about 3 times a night but at about 8 months stopped feeding as often in the day. She was feeding very frequently, often several times an hour during the day. Now she usually has at least an hour between feeds, often two. She also increased even more the amount of solid food she eats and increased a lot in weight, she was underweight due to issues with food allergies before this which I think is why she was such a frequent feeder. At about 8 months she also got a bit more independent. Before she liked to go to other people but always kept me in sight and would want to come back after a short time. Now she will actually choose other family members over me and sometimes spends an hour without even wondering where I am.
So every one is different but it is at least possible to get your period back with a frequent feeder. It seems like the change in frequency and amount of solid food was enough for me even though she still feeds frequently. It remains to be seen if my cycles will be regular but TTC is at least a possibility!