Confusion.... Help!

I have a concern with my period or I should say extreme lack of lately!

Just a little back ground. I have 3 live children (11, 4, 2) all girls. I had a 6 week miscarriage and my daughter, Nathaira Rayne was stillborn Oct 25, 2018 at 31 weeks pregnant but she was gone at 28 weeks. CMV is what took her from me. It came from my 2nd daughters new heart when she recieved her heart transplant because she was born with CHD and went into heart failure at 10 months old.

Anyway so after Nathaira was born i bled for almost a month. I bled from the 25th of October to the 21st of November. Then i had a regular period December 17-21 (which is odd because my periods are never regular, usually 65ish days). Then my next period was regular again, January 24-29 and I havent had a period since. No spotting. No positive ovulation tests either. I am not on birth control but we are not trying right now because its too soon and I need to have time to develop antibodies to the CMV before trying again and that can take 6 to 12 months. Its only been 7 months since she was born. I use ovulation tests to make sure we dont have sex too close to ovulation and also to know when i will get my period since my periods are so far apart and unpredictable. Well like i said i havent had any positive ovulation tests in the 4 months since my last period and I had very light blood streaks in my mucus when I wiped on the 20th (2 days ago) and today (22nd). On the 20th I thought it was FINALLY my period starting, but it stopped for a day and came back and stopped again. But i mean it was hardly there at all. Not even enough to reach my underwear. I thought maybe ovulation bleeding but I took an ovulation test the evening after the first spotting and the day after, so yesterday and nothing. It had such a light test line you could barely see it so not even close to positive at all. And then extremely light spotting again today and nothing again. I am so lost right now! Anyone have any ideas? pregnancy tests are also negative and if I was pregnant ovulation tests would be positive too. Thats how I found out i was pregnant with Nathaira trying to track my ovulation and it popped positive very quickly! Just need a little help please. Thank you!