Opinions please

My first pregnancy ended in a miscarriage at 6 weeks last August. I had quite strong symptoms, from 3 weeks my body felt "off" so had an inkling I was pregnant early on. We've just started TTC again but since miscarriage my periods have been slightly more irregular with longer cycles (29 - 34 days). Last cycle was 34 days but my tracking app is currently estimating a 31 day cycle, with ovulation happening on day 18, but think this is likely a little early. My husband and I had sex on day 19. Unfortunately the past 5 days I've came down with a horrible vomiting bug, so lots of nausea, bloating etc etc. My nipples have been getting sharp shooting pains and breasts a little heavy, and getting a pulling, feeling of fullness around my bellybutton. Also extremely thirsty and a weird taste in mouth. Are these just symptoms of a stomach bug or could I actually be pregnant? Think it's too early to test either way!