Letrozole dose increase

Sa

This is cycle 3 for us on Letrozole. The first 2 cycles I was on 2.5mg CD 3-7. This month my doctor changed it to 5mg CD 5-9. Today is day CD 8 and I’m feeling kind of sick. Hubby has a sinus infection but I don’t think it’s from that. It more of a stomach thing. Do you think the Letrozole could be causing it already after a couple of days?