Still don't know

So, I'm TTC and I tracked my ovulation last month to the t. I was 3 days late for my cycle and it was unusually light. Bright red color, no cramps or back pain. It lasted 5 days and it was gone. I'm gaining so much weight and my nipples are starting to get really tender. I'm overly emotional and moody. I calculated from the time I TTC to now and I may be a little over a month. Can I still be pregnant even if I had a slight period? I really really wanna know.