bleeding after sex

Hi ladies…very worried and I was wondering whether anyone could offer me some advice? I have had a bit of spotting about 21 months ago. Nothing significant. I went to my gp and had full blood count and smear and all was fine. I have only spotted twice since then. But recently after sex I have started bleeding, first time was approx 8 day’s after my period and was brownish. Second time was red blood and again about 7-8 days after my period. I have no other symptoms and I stop bleeding after it doesn’t last but I am absolutely worried sick! I’m 38 and have been with my husband for 24yrs…I’m on no medication and don’t take the pill. Please help if you can.