We dated 5 years ago but had to break up after she moved away to school. We both found each other again after running into each other at a store. Completely random but honestly magical as we've both always thought about each other over the years. So over the course of the last 6 months we've been having coffee from time to time and Facetiming/Talking over the phone because we agreed to take it slow. For Valentine's we had an official date and it went AMAZING. We both agreed to start dating and that the time was right to move forward with the relationship.
Well, the last 3 days she has been really distant out of NOWHERE. It's typical for us not to talk everyday as space is important at this stage. But I texted her how her weekend was on Sunday and she didn't respond. I didn't read anything into it as she can get busy and completely forget. We did speak Monday after I texted again and said I was thinking about her. She sent 2 texts, 1 with a smiley emoji (emojis are big with her. Not all girls but with her it's a huge sign). But after not talking for a day I texted her and said "I've been thinking about you today! Do you wanna talk over the phone tonight since it's been awhile?" ...and I never got a response. Should I be concerned now despite the relationship going incredibly well? Or should I assume it's just her time of the month and she just doesn't feel like talking? Typically she tells me if there's something big going on in her life that's bothering her. Granted, I know it could be a plethora of other reasons not involving me but I'm not sure what to think.
I'm not freaking out, just not sure what to do...I need some girl advice and need to be able know how a girl sees this situation. Btw we're both in our early to mid 20s.