Not sure when to test yet...

Hi everyone, this is my first post, and I'm a bit new to TTC.
​My husband and I decided on 04/27 to try to concieve for the first time. I was on birth control prior, but I had missed at least a week worth of birth control. I haven't had a regular period in a while, mainly because I was on a BC regime that required me to take an active BC every day, no placebo pills.  Main reason for this was because I have PCOS, and doing so helps reduce my symptoms (mainly pain).
​We BD'd on 4/27, 4/29, 4/30, 5/1. On 4/30, I took an opk, and I'll attach the picture. I don't think it was positive because I've heard it's supposed to be as dark or darker than the control line. On 4/28, 4/29, and 4/30, I had very light spotting. I got a thermometer to start temping on 5/2, temp was around 96.4, started rising day to say, and has been consistently hovered around 97.2 to 97.6 since 5/4.
​Since 5/3, I've been experiencing nausea. It started that evening, and has been consistent every single day. Driving  / motion makes it worse, eating makes it better for a short while. Also had other symptoms, which I have never experienced in my life in conjunction with PCOS. I suspect I might be pregnant, but I know it's too early to show yet on the $1 dollar tree tests, as I tried this afternoon.
​What I don't know is how long my usual cycle is, because I haven't had one in quite a while. I don't know how long my period length is, as it's my first month off BC.
​If you were me, what date would you start to test with an early prediction test? Or a regular test? 
Thanks for the help, and for reading this long post. I wish you all the best in your journeys! 
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​ Below is the picture of the 4/30 opk.