Can I have some advice?

My period was late by two ish weeks, and has been the lightest period I have ever had in my life. It's concerning to me. To answer a few questions, yes I'm sexually active. No, I'm not on birth control or using condoms/pulling out. But it is a little complicated. (He had testicular cancer/chemo therapy 5 years ago and it had drastically lowered his sperm count. We don't think it's impossible it get pregnant, but it's not going to be easy)

I just read online that you bleed in the beginning of your pregnancy, and it was really light. I just wanted some advice, and I don't have anybody to ask besides my mother or aunts who I don't really want to know that there's a slight chance I could be pregnant. Any advice helps. Thank you.