Ttc question

We are unsure if ovulated as think we missed our peak (lines when almost positive on opk for 1 day then back super faint the next day) have been negative since.

Anyway, on Saturday we have an event which will involve lots of alcohol (Christmas even) I will be suspected 8/9 days since these 'dark lines' so I'd assume between 7-9dpo? Depending how long after ovulation took place if we missed it on opks

I've been unwell with a cold for almost 2 weeks ongoing and now having some stomach cramps, back ache and nausea (could be related to being unwell)

I have no clue when my period is due as we had a mc 18th Nov.

My question is would a test show positive by Saturday if pregnant or do I just avoid alcohol.