2days delayed period am I pregnant?

I'm a breastfeeding mom I take pills and we don't used condoms. Sometimes we just let it flow inside I don't know if it's safe. These past few weeks, we were so active like every single day we just f*ck and I am really afraid to got pregnant again. Last week I bought pregnancy tests and it came negative. I was convinced, because this week was my period starts but then it's already 2 days yet I haven't had my period.