Helpp!😩i don't even know what to think

Josie • Just a 20 year old girl livin life tryin to get by ... 🙋🏼🙆👑💋☘🌺🌞
Okay ..🤔🤔🤔 i started my last period 42 days ago.. Lasted for about 7/8 days, been off of it for 34 days ! I can never tell when my period will start because I'm so irregular . I don't take any thing or use protection because me and my old man have been trying to have a baby for awhile . We've actually never worn protection or pulled out ?!. I finally got pregnant last year but lost the baby at 7 weeks 😥😒didn't have my period after that mc for about 3 months till November I got a positive preg test well more like 10 (lol I always go crazy with them ) ..but  lost the baby at 6 weeks  . Of coarse ..I ended up getting my period after that at the end of December right before Christmas, it lasted 7 days ..skipped January.. And had my last period February 11th it lasted 8 days . I don't know if I could be pregnant because I don't know if I'm late or still have days to go till my next period ! 😩😩 I took a test the other day and it came out negative it was the 6 dollar ones . I have one more when do y'all think I should take it ?!?! I've been feeling nausous lately and so tired ..  Should I be worried about it or just wait for period to come ?!how do us "irregular girls"keep track of our cycle 🙄😒😒