Ovulation/fertile spotting ????

My partner and I had protected intercourse about 2 weeks ago, I ended up getting my period the next day for 3-4 days which is normal. He kept making jokes about baby number 3 blah blah, maybe his too strong & got me pregnant although we used a condom and I laughed it off. Now 2 weeks later I went to the toilet today and TMI but saw brownish discharge on the paper, then a few hours later I went back to the toilet and saw red/ but more pinkish discharge. Now I’m paranoid asf 😂😂 I already have 2 kids I should know already right but I’m still crapping myself haha! My P.D app says I’m fertile right now, could that be the reason for the spotting/discharge?? Thankyou