Maybe pregnant. Need help

Aj

I’ve been trying to get pregnant for 3 months now. Each time my period 2 weeks late, no symptoms at all. Then it comes back heavy the 1st day then 2 days later I’m spotting. This time my period is a week late, and I’m experiencing headaches randomly, numb cramps, and bloating (more than normal). i took pregnancy test. 3 to be exact. Negative, positive, and negative. Did anyone experience this too?