Spotting 1 week before period

The spotting was pink the 1st day, but every time (wiping) since then has been light brown. It's very light spotting (only a drop size of light brown in panty liner) no cramps, 1 week exactly away from my period being due and I am very very confused. I'm not sure if I could be pregnant. I had a baby 7 months ago and cycle has been very very irregular. I had my 1st 28 day cycle last month. I believe I also ovulated last month, between the 25-28th of Feb and my partner slipped up (like 6 days before I felt myself ovulate.) There was also another time, during my fertile window, when we got drunk and had sex...and I swear on everything he came inside (he doesn't remember finishing at all but I smelled it and felt it and it's very different compared to my discharge so idk???) Please give me some adviceeee I'm freaking out I don't want any more kids and usually I'd be cramping by now 😭😭