First Signs Of Pregnancy

i’m just wondering if there are any sypmtoms earlier than a missed period to tell whether you may be pregnant. for example i am on day 19 of my cycle and i think i ovulated around day 12/13. but this month i have had a lot more cervical mucus. until just yesterday?? i’v also been feeling a bit under the weather but i’m not sure what to think?

my period is due on 18th this month.and today morning when i wake up i went to pee…….and suddenly i felt faint and feel like vomiting but i didnt vomit.i was too tired.and constipated too.my head was turning like nothing.my view got dark. then my hubby only carried me to the bed.this is first time that happend to me. we r ttc. so im suspecting weather this is an early sign of pregnancy? pls tell me some suggestions.