Confused

Hi there, so I ttc on 20th when I was ovulating and also on the 22nd and 23rd. I was experiencing cramping on my left side every day but it came and went. Then about 4 days before my period was due I had period like pains but no period and for a week or 2 I've been extra tired and had headaches and feeling sick in the morning and night but that started 2days before my period was due on the 4th this month. So I was 10 days late and negative test I went doctors and they made me take a test and still was negative. Then that same night my white mucus turnt pink and started to cramp in the middle but still no sore boobs or back pain or grumpy just been very emotional and my period came but wasn't as heavy as it normally is and now it's the 3rd day and it's very light. Does anyone know what may be doing on. I'm going back to the doctors hopefully they can give me a scan to see what's going on but I just need other woman advice to what might be happening.