what does this mean?

I lost my virginity in April. Got my period 4 weeks later (normal time frame for me) for the month of May. I'm expected to get my period in the next 2 weeks for this month. But I've had cramps and clear discharge during my fertile window according to eve. Is this normal? 
I'm getting paranoid thinking I'm pregnant from all the times I had protected sex in April even if I got my period in May cause I've heard that some women can get a period in their first month. :(