Could it be?!

So here recently my SO and I have been trying but not trying to conceive. Well during Memorial Day weekend it was prime time and we'd done the deed multiple times during my open window, well during June I felt I had a pretty normal menstrual cycle. Here we are in July and my window for my period to being started on Monday and Friday is the last day for it to begin without it just being plain late. My periods have always been on schedule so it's a very slight chance of just being plain late. Yesterday I started with a faint reddish discharge but no actual blood, I've been having slight uncomfortable cramps this week but nothing like my regular almost unbearable cramps commonly associated with my period. So I guess my question is, could this be it? Even after having my period last month? Yes, I plan on taking a test tomorrow morning if I don't start by then. Anything that y'all have experienced or personal stories are welcome ❤