Pregnant or not?!

Vannesa

I have been taking letrozole (femara) which is suppose to boost my hormones in order to conceived. I had cramping on 7/8 for an hour a week before I started spotting. The spotting on 7/13 lasted 2 1/2 days and no other menstrual symptoms happened. Took a test a week later on 7/20 and BFN. We’ve been trying for two years and nothing. Should I keep taking them?