I Had A Miscarriage On Sept 12. On Sept 25

I had a miscarriage on sept 12. On sept 25 I had unprotected sex for about one minute. It was right at the beginning so a slight chance of precu but he didn't finish or anything. I started light spotting on October 16, 17 and 18 then had a heavy flow the 19 and 20, light on the 21, normal on the 22 and then light on the 23 with spotting again the 24th. I've been concerned if this was my period or posibly implantation bleeding. I have taken a few hpt with the last being yesterday (Oct 29) 34 days after sex and they've all been negative. Yesterday (Oct 29) I woke up with a migraine, and a little nauseous that lasted through the day. Today I have a slight headache, also a little nauseous, no appetite, and cramping with watery discharge. I don't know if these are pregnancy symptoms or if I'm getting ready to ovulate.