Bfn, but no period :/

Hi I'm 31 and have a 12 year old girl and a 10 year old boy. My husband of 4 years doesn't have any biological children and even though I've mentioned having another for 4 years, lol, he is just now on board. So it's been a few months, but I'm really thinking somethings wrong with either him or I. We were off and on throughout our marriage just trying or "not caring" I guess you could to have a child with no luck. I have irregular periods to the extreme. I've never been on birth control longer than 6 months just trying new ones. I always had such horrible side effects. It's super hard to track me ovulating, but no I haven't bought ovulation tests. I'm exactly ecstatic about having another kid so far apart from my first two, but I'm definitely in love with the idea of giving my old high school sweetheart a baby!! The last few months I have been regular. I check my cervix and cm all the time so I feel I'm very much in tune with my body. At this time I am 5 days late (assuming I would be on time with the last two months). My last cycle started around the 19th and later until the 24th, barely. It wasn't a big or bad one at all. Twice this month have cramped. We made love just about every single day. If I'm not prego it is not from a lack of trying. Because I've been irregular before I mentioned all the time would be best lol. But twice I cramped. Once was when I projected to be ovulating and then a week later I was cramping dull cramps. Sometimes one sided and sometimes not for 4 days. I've taken so many tests it's unbelievable really. I'm going to assume I've had about 4 evaporation lines since I've had more bfn. I had just a bit of pink when I've whiped on the 17th and was like oh implantation bleeding which followed soon after the cramping. Then on the 21st I had a Lil bleeding slight red and then pink 3 times I whiped, so I thought :( af is here, but then nothing since! My breasts aren't sore, but my nipples are extremely tender and feel bigger now for 3/4 days. Other than that constipation and somewhat heavy cm is really the only other possible signs of pregnancy. A week ago (which I feel is impossibly too soon to feel) I was nauseated every single night for 5 nights and then it stopped. I'm so confused and disheartened. I know it can take a long time to get prego, I've been in the medical field for years, but it seems my body is soooo jacked up right now. When it menstrate it mostly comes with migraines bloating and crankiness galore! Right now nothing. I'm just me. No symotoms, nothing....but no period and no bfp. Sorry about the book, but it's hard to put that all into Google search. Please help. I feel too old for thid kind of stress!! Lol