This Old Lady...??

So I was at work yesterday, this older women came to my station and was talking to me and she touched my stomach and said ... your having another baby. I said No I'm just chubby as I backed her hand away (I had a baby about 9MO ago) .. she said No your having another baby and touched my stomach again... She acted as if she knew for sure !!

I just find that so weird. My SO and I had unprotected sex two days before ovulation and on my ovulation day. I tested two weeks ago and I got a negative.. and my period started the next day.. and now this lady yesterday got me thinking.. should I test again ? Has anyone had there period and was still pregnant?