Pregnant? Or could this just be a aftermath of the Clomid?

My partner and I have been trying for the last 2 years to concieve. For the last 2 months, my ob/gyn has had me taking Clomid as my periods have been irregular for the last 2 years. After the first cycle of Clomid and feeling my body go through ovulation, I had my first 'regular' period (my ob/gyn told me the dates I should expect my period and it came a day, 31/3, before the original date she had predicted and lasted 5 days). At the beginning of last week 16/4, I had a turn of nausea where I brought my breakfast up. Since then I have felt queasy every morning and after I eat anything, throughout the day except at night. I also feel queasy when I have anything rich to drink (e.g. coffee with full cream milk). My partner remarked on that my nipples have become very enlarged, and looked a bit darker, although looking at them today I could see the enlargement but not the colour change. For the last week I have also been extremely tired to the point where I have to lie down in the middle of the day for a few hours, whereas beforehand I was fine. I have also been having mild to moderate cramping in my pelvic region, although it feels like a different cramping as to when I get my period. I did a home pregnancy test this morning and it has come up negative. What I want to know is could I be pregnant? Or could this just be a aftermath of the Clomid? I haven't taken anymore Clomid since these symptoms started, but I am just unsure. Should I go to a doctor or wait a while longer and do another home pregnancy test?