Possible To Get Pregnant The Day After Your Period?

Tori • Engaged to my best friend 💙💍, cat mom 🐈🐈🐈🐈, one angel in heaven 😇, trying for 🌈

Didn't have a period for 3 months

Then it showed up no symptoms or anything that it was coming

I'm a heavy bleeder(bled through my pads heavy)

Wasn't as heavy(not normal for me)

Lasted 5 days

My fiance and I had sex the day after my period

My boobs have been sore, have killer heartburn and nausea every morning

Took a couple tests last week and they were negative

Could I be pregnant and I'm just not far along to receive a positive?