TTC after birth control & missed period

I stopped taking the pill in January and really started trying in April, I still wasn’t sure when I ovulated so we tried every other night. Monday the 23rd I was due for my period and it didn’t come. I did get some very light spotting that night (kind of a rust color), nothing like the beginning of a period for me. I also had very slight cramping before I got the spotting. Could it have been implantation? Or maybe my period is just late because coming off the pill? I am now 4 days late. I have a few other symptoms but I don’t know if they are just in my head! I’m waiting to test until Sunday, because I feel like there is no way we got it on the first month trying!

Any thoughts!?