Help ? Anything?

Me and my guy have been ttc for a little while now and yesterday was our peak of fertility.. And then we had intercourse this morning and I've been nauseous all day. My LMC was a day late and wasn't normal and even got spotting couple days after that. But my PT was Negative😿 I took one today and I swear I see a faint but maybe just my eyes ?? What should I do